What kinds of interface do you have?
I love recommending the AT202 since it's cheap and works pretty well. Its a Large Diaphragm condenser mic so it would be good for things like vocals and acoustic guitars. For regular electric guitar amp micing you really want something like a Shure SM57 or a Senheiser e609.....
An SM57 will sound equally blah on everything. But it definitely will get the job done.
So I guess what you guys are saying is that there are two mics in my future.
Get the nicest Audio Technica LDC you can afford and a 57.
You'll be set.