You may all know, but worth stating for those that don't.
Rates come out every day. PAR is sorta of the base rate of the day where the guy makes a good commission. You can pay points to buy the rate down (rarely a smart thing to do), or he can charge a higher interest rate and make more. Most try to maximize every penny on every deal.
Find a guy that works on volume rather than big commission checks.
My favorite guy made $500,000 plus every year for 12 years, had everything paid for he wanted to own and a couple of million in the bank at 40 and quit to pursue the bass fishing tours and sponsors. Oh yeah, and no kids. ;D