Ok, on the advice of cRock and JustAnEngineer, I ordered an Antec SX635 (ordered wednesday, recieved friday;the joy of living near the warehouse center of america, Dallas). So anyway, I haven't gotten any internals for it yet, but that shouldn't stop anyone from stripping down their new case and checking what everything does, how it attaches, etc.
During this inspection I come upon a weird handle-looking thing labeled in the manual "card guide." What the heck is this? I can't see any use for it, other than the fact that the holes in the middle of it line up with the expansion slots in the back of the case.
Thanks for the help