Maybe just because we're new, the "features" seem pretty important. Maybe they're not?
I know I did this when looking, and Ben Wilmore (whereisben.com) did the same. I constructed a spreadsheet (could have as easily been done on a piece of paper). On the spreadsheet, I came up with all the categories/features that I felt were at least somewhat important to me. Then to each one of those I assigned a weight from 1 to 10.

Then for each bus I considered, I filled in the blanks, from 1-10 and got a score for every bus I considered. Maximum score would have been a score of 10 times the number of entries on the scoresheet. Although this couldn't for sure chose "the" bus, it very quickly ruled out the ones which were not contenders, and grouped the few contenders at the top of the list.

Don't include just features, but any aspect of the decision that you may feel is important. Unknown maintenance history? Need new tires (that's $6k right there). Nice, but needs a paint job? That's another $15k-$30k. I think you get the idea.

Afte awhile you'll find that you'll start adjusting the weightings as you get a feel for what's more important to you. That's why a spreadsheet is nice.