I'd have to say the Quest is fairly low end, and you're correct, there's not much on it. The Shimano Tourney RD is usually found on low level bikes.
You could probably stand to do an upgrade on the MTB, possibly by looking at the local CL. CL is a great place to look for bikes, although the competition will be a bit fiercer because you're in a college town. Still, you could possibly pick up something decent, both for road and MTB bikes.
There's quite a few BF members in Michingan, so you might want to check into the Great Lakes regional forum and say hello to your fellow locals.
East Hill
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TRY EMPATHY & HAVE LOVE IN YOUR HEART, PERHAPS I'LL SEE YOU ON THE ROAD...