I've been eyeballing the GTS-AV's for a while actually. The only reason I have the BR01's now is because of the awesome deal tirerack.com was running at the time. 4 BR01's for the cost of 1 GTS-AV basically...
I do know the 19x9.5 +45mm fitment works on all 4 corners with at least 275's. I don't run staggered and I have the exact same offset lowered on steeda sports without rubbing.
Just be warned, 19" tires are significantly more pricey than 18's
2011 3.7L MT82 Kona Blue GT/CS Pedestal Spoiler, Cervini's HE hood, Stillen chin spoiler, BBK headers, GT T/B, Steeda tune, Ram 9.5 Dual Disc clutch, 3.15 axle T2R Torsen, 285/35/18 w/ Steeda 18"x 9.5"+44mm Q1s, Steeda Sports springs/Koni struts/Viking shocks, Shelby adj front sway bar, Boss302 Rear sway bar, Whiteline Watts Link, 14" "Brembo-ish" brakes and 3/4" front wheel spacers/ARP studs.