I've just purchased a bike built up with a new 2012 SRAM Red component group. So it's got the XG-1090 cassette on it. Very nice. However, I have 2 wheel sets I'll be using on the bike, one of which has a PowerTap, which means buying another cassette. I'm wondering if I'd be just as well served with the considerably less expensive OG-1090. Anyone have any experience/opinions in this area? I know I could just switch the one cassette from wheel to wheel, but I'd really prefer to avoid the hassle as well as the wear and tear on the lock ring.

Thanks