I would REALLY like to get a different cassette in the back. I think I'm okay with my 30 in front, but right now my rear cassette is running a 12 x 27, which I realize is more granny than most have. I just changed it out last fall and haven't ridden it a ton yet.

I want to get strong and be able to do all those steep climbs with my current configuration, but I don't want to fry my knees. I'll keep thinking about it and looking for used mtb cassettes on craigslist and ebay.