I agree with helmet on the topic of PRSs, I would be looking at getting one of those myself if it weren't for how I heard from Jeph the pickups won't work well with really low tunings. You ought to be able to get just about any of the SE models for $550, not sure about tax though.
I probably don't have to tell you this, but try out any guitar before you buy it, if it is at all possible. If the people at the store don't want you to try it out, there is probably something wrong with it. At my local store, they let people play the $1500 guitars, with supervision to make sure you don't break anything.
If you live in the hind-end of nowhere, you might not be able to find a store, but hopefully you at least have a guitar center or something.