The Crawler is an awesome pickup in the bridge of a PRS as I used one in a Custom 24 and I ended up using the guitar for almost everything. If you want an alnico V in the neck, I can heartily recommend a Holydiver. The light wind gives it a distinctly PAF feel to it but the AV magnet gives it more cut. It's nice and bright with a wonderful musicality to it. Takes loads of gain and has excellent cleans too.
The other option I used with some success was the Emerald neck. It's AIV but it's a hot neck pickup and uses a more modern wire than a traditional PAF so the feel and cut are a lot more modern.
