I'd really keep an eye on Craigslist and Ebay... maybe even post flyers in the neighborhood and/or give them out a pawn shops so that they can spot your gear if it comes in.
Hawking a $3000 PRS custom without drawing attention is not going to be easy. Don't give up.
Another thought is this... I think you're right. I think they heard you playing, figured out when you were out, and then hit. This means it could be someone who lives close by and was on foot passing your place when they heard you practicing. Maybe walk around the neighborhood just keeping your eyes and ears open. Ask anyone you bump into if they saw someone carrying guitar gear on the day it happened... you never know. Worth a try.