Hi NOGBAD,
If you want big magnification get a microscope and camera adaptor.
If that's too big ,get a bellows as suggested in the other thread.
If you want to take normal things like bugs etc ,then indeed you will need a macro type lens.The shorter the focal lenght of the lens the closer you have to get to your subject.For example at it's NEAREST focus distance, the 60/2.8 NIKKOR is about 75mm from the front edge of the lens to the subject.The Sigma 105/2.8 is about 125mm from the front edge of the lens to the subject.
The reason I say this is because the closer you have get to your subject the more you are likely to frighten your "bug", and block out the light with your body/camera.
At the "shorter " end of the focal lengths, you can consider the 50mm Sigma, 60mm Nikkor,90mm Tamron, 105mm Nikkor and Sigma.If you can get a shop/store before you buy, try some and you will see what I mean.
Some of these lenses, new (may be outside of your budget) but can be found S/H within the price you have set as your target.
If you already knew all this then sorry, for wasting your time.
regards Subzero.
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