A 57 is a good first choice for your budget. Everyone has one for a reason.
The E609 will bring more top end detail to the party, but personally I find them a bit toppy and sterile to use as a sole mic given the choice.
If you are willing to spend a bit more, I HIGHLY recommend the Heil PR30:
http://www.heilsound.com/pro/products/pr30/index.htm
-It's an excellent mic. I did basic tracks for an album with one last weekend, and it sounded really impressive. If I were looking to record guitar and had a budget, it'd be my first choice. I'm definitely picking one up for myself.