Re: PGs instead of '59s ?
If mids are a concern with the PG for your taste, don't overlook the APH II bridge pickup. It's got such an even, creamy, balanced sound....it's hard to beat IMO. The neck is also my favorite...with the Seth running a close second.
If you want to keep the 59' in the neck, I'd think a PG would be better in the bridge. I've also found that I love the PG clean in the neck, but overdriven it's a little upper mid heavy for my taste...or I just haven't found the right guitar for it.
APH/59'
PG/59'
Good places to start.