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The IS lenses are very good, and yes, worth the extra expense. If you are speaking of the 18-55 IS.. it’s a good lens.. the 18-55 non IS is an adequate lens..
As long as the lens is EF-mount, it will fit any EOS body digital or not.
This include all the after-market brands as well.
The only thing that you will need to watch out is whether the lens is EF or EF-S design. Which in your case, it really doesn’t matter.
Since this is a DSLR you actually can use any EF Lenses that Canon offers without problem
I’m not a Canon user, so I can’t name specific lenses, but it sounds like you could use a visual aid to help you know what lens reaches how far.
Here is a mini-tutorial I made myself to compare focal lengths. This is NOT a lens test or a camera test! It is merely intended to show the difference between various focal lengths. The lens was the Nikon 18-200 VR lens, which is (by definition) an 11X lens, but that 11X does not tell you what the final image will look like. I added one more frame taken with a 300 mm lens. The camera was a Nikon D200 so there is a 1.5X “crop factor,”"lens factor,” or “focal length multiplier.” Your XTi will have a crop factor of 1.6X, so the tutorial will be valid for you as well, since that’s pretty close to the same thing. There is further explanation on the image itself. It would help if you click on “All Sizes” above the image.
http://www.flickr.com/photos/7189769@N04/476181737/
This was done with two different lenses: the Nikon 17-55 and 70-300:
http://www.flickr.com/photos/samfeinstein/1245831147/
A true macro can cost quite a bit.
As for the whole crisp and sharp thing, thats really up to you, and to some extent the settings in the camera. That kit lens can actually get pretty sharp zoomed to about the middle (not all the way in and not all the way out) and the aperture somewhere in the f/8 to f/16 range. Set your camera to Av, roll the wheel behind the shutter button until you set your aperture to 11 (just a number in the middle), press the shutter button half way and see what speed it gives you. If its less than 1/50th you will need to increases your ISO, just increase one step at a time as the higher ISO’s give a lot of noise. Find a happy medium and shoot.
The first lens i recomend is the http://www.bhphotovideo.com/c/product/169267-USA/Canon_6473A003_75_300mm_f_4_0_5_6_III_Autofocus.html it’s a bigger zoom than your kit lens.
The second lens I suggest is the http://www.bhphotovideo.com/c/product/12142-USA/Canon_2514A002_Normal_EF_50mm_f_1_8.html It doesnt zoom at all, but it has an aperture of f/1.8 which is awesome with low light situations. It also is a bit sharper than your kit lens. It does these things better because it just has to do them at 50mm and not a whole zoom range.
For Macro or close up stuff you could just get one of these http://www.bhphotovideo.com/bnh/controller/home?O=search&A=search&Q=&sb=bs%2Cupper%28ds%29&sq=asc&ac=&bsi=&bhs=t&shs=&ci=158&at=Magnification_Set&at=Size_58mm&basicSubmit=Submit+Query it screws onto your lens just like a filter (you should always have a UV or sky filter on your lens more for physical protection than anything else). They make higher magnification ones as well.
There isn’t a lens that is best for the camera. The camera does not care. For as long as it’s a Canon EF or EF-S mount, it will gladly take the lens and use it to the best of your abilities as a photographer.
You need to choose the lens that is best for you, as a photographer, and of course that fits the specific purpose for which you want to use it. Last but not least – it must be a lens you can afford. Some of the high end lenses easily run into 5 figure price tags!
Often more than one lens is needed for different tasks. However, there are some decent all around solutions. One such lens is Canon 18-200mm lens. It’s a great all around lens that you can keep on your camera all vacation long and never have to change. This is very convenient. Of course being over 11x zoom, it’s got its shortcomings. It won’t be as sharp as primes or lower range zooms, and you are bound to some distortions here and there. Many many people though agree to put up with these shortcomings, because having just one do it all lens is very convenient.
If you want to go with smaller rang lenses, consider 18-55 and 55-200 lenses – cover the same range, weight and cost much less and will probably give a bit better performance. But you’ll have to switch them around.
Want to do serious landscape or architecture work? Go wide. Something like 10 or 12mm on the wide side. Bird watching? Wildlife? Spying? A long telephoto, at least 300mm on the long end is in order. Portraits? Get a prime – 35mm or 50mm (no zoom). And so on. Sports? Concerts? You may want a fast telephoto – f/2.8 or so, but they are expensive…
So you really have to define the task to get a specific lens recommendations. Better yet, read some books about photography to get a decent idea of how lenses work, and you may actually be able to judge for yourself then.
LEM.