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For an initial low investment in your bug shots, I'd suggest a set of extension tubes. They normally come in sets of three, although you can buy singles. They're fairly inexpensive, and since they contain no optics, you can feel confident in non-Canon brand tubes. Here is a link to a set of Kenko tubes (I have these) at B&H for $129:
http://www.bhphotovideo.com/bnh/cont...u=71515&is=REG
You can get some surprising results with your 55-200mm lens, I would guess. I've used them on a 50-500mm Sigma to get some great dragonfly pix. No, you won't get as good an image as with a true macro lens, but you can do a pretty good job. You can try them on both of your lenses, but my guess is that you'll get better results on the 55-200.
An advantage of the extension tubes on a telephoto is that you can be farther away from the subject, so it is easier to light it with single strobe on top of your camera without the risk of lens shadow on the subject.
B&H is a very reputable online dealer. I've also been happy with newegg.com and digitalfotoclub.com. One place to get a read on online dealers is at resellerratings.com.
The sample image below was with the Sigma 50-500 (aka "Bigma") at 500mm with the 36mm tube and a Canon 420EX speedlight. Wind was gusting12-15mph, and the dragonfly was clinging with all six legs and stabilizing himself with constant flitting of his wings. The end of the lens was about six feet from the dragonfly. Shot at RAW at ISO 100, f10 and 1/200th (flash set on HS sync).
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