Really glad i picked this one - Celestron Mini Handheld LED Illuminated Magnifier (Loupe) - 10x

This magnifier has much better optics (3-elements) compared to single-element models out there, but doesn't have the exhorbitant price of Some of the other 3-element designs. Images are sharp over the field of view and the light makes a huge difference when you need it. The light is circular and evenly illuminates the plant/insect/stamp/coin your looking at. I didn't notice any chromatic abberation, unlike single-element magnifiers. It comes with a nice case too. I bought this mostly for flowers.
Pros: Crisp optics, nice case, and the light really really helps
Cons: The switch on the light feels a little cheap

This review was written in the old system and had content requirements that are different than reviews written today.