Mr. Rain Cloud
Good decision on buying the 85mm f/1.8--it's a solid performer, and will be pretty useful when you need realllly fast aperture settings, plus a lightweight, easy-to-handle lens.
I'm an enthusiast 7D shooter, and I can say I've never had issues with it's ISO. It has 2 DIGIC IV processors, making it's low-light processing much better than what you'd get out of an entry-level dSLR. Also, shooting in RAW will help when doing noise reduction in post. It's cheaper than the 6D (by a lot), which you won't be able to use your EF-S lens with. and the 7D's 1.6x crop sensor will give you more effective reach. Also, don't worry about it becoming obsolete any time soon. Canon released a firmware update last August that quelled rumors of a replacement coming soon. That update now allows you to burst up to 25 RAWs at 8fps, which will seriously make you happy pants if you haven't experienced it before