How do you plan on using your Raptor? Will it be a Mall crawler/daily driver or do you plan on using it off-road? Those are the real questions you need to ask yourself. I've had 20's, and went back to 17's last year. I use my truck off-road, did a couple Moab trips, and hunt quite a bit, so after a while with the Venomrex 601's(20"), I got tired of constantly worrying about my wheels getting scraped or nicked. That's when I went to the 17" Black Rhino Abrams with Yokohama MT3's........no regrets at all.
I liked the look of 20's on the truck, and for DD & in-town, their great. Much lighter and handled turns great with 35" Nitto Ridge Grapplers; but overall, I'm much happier with the 17" Abrams wheels. I get complements on them all the time, and don't worry much about scratching them off-road.