I use a completely separate camera, a Panasonic P & S. See my post of 2/4/2008 with a couple of sample shots.
This little baby 7mp P & S has an ultra-sharp Leica lens with beautiful bokeh, but is of course pretty much limited to 8 x 10 prints. The secret is that the rig is so light and nimble that you can often get between the branches and get the shot without frightening the bug and before it gets away!
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Before I offer up an opinion, what exactly are you trying to shoot, what is your intended subject matter. If you are shooting things close to you, and maybe the best all around lens is a 90-100mm macro lens. If what you are shooting requires a decrete distance, say a poisonous bug or animal, then the 180mm or longer tele with filters or ext tubes would offer some room for safety. If you are copying flat work then a 50-60mm macro works fine...so it all depends...
A T/S macro lens is a very nice lens if you have worked with T/S before, you can do more DOF control, both to add or remove and do selective focus very nicely, fun to play with if the subject is not moving, flowers, most bugs ......