LS> Price range should be in the amont of a Shure SM 58.
Use a Shure SM57 if money is tight.  If you have more to spend, use a
Sennheiser 441.  (I prefer the SM57 though.)
A SM58 is not my first (or second) choice to mic a guitar amp with.
--gary
... I saw Elvis. He sat between me and Bigfoot on the UFO.
--- Maximus v3.01               
---------------