Sean,
If you get a loupe that is too strong, you will end up seeing the grain of the glass and not the image. And that happens at about 10x. I use a Toyo and it costs about $50 or so dollars. You will have no trouble focusing with something like that. Or you can buy some of those glasses that are used for reading. I used to buy them at Wal-Mart before I bought this Toyo.

lee\c