I work for Enterprise Rent-a-Car an have driven every one of the SUV's mentioned an then some. Here's my .02 based on driving em for short amounts of time:
Dodge Durango--sucks, no power, weird interior, but sounds pretty good. IMO the worst SUV to choose from.
Jeep Cherokee--not too bad, but not alot of room inside, it does have some giddy-up though
Jeep Liberty-probably a little too small for what yer lookin for, but they are nice. I drove one when they first came out years ago an hated it. But they've improved. Nice interior, decent power.
Chevy Trailblazer--very very nice. Good power, handling, interior, looks pretty good too. I really like em. 4x4 was nice too.
Chevy Tahoe/GMC Yukon--same car, really really nice. Good power, nice interior, but they felt really big.
GMC Envoy-wow, I probably liked those better than the Trailblazers. Good everything on those, my mom wants one. (i'm trying to get her to buy one from Enterprise)
Ford Explorer--i dont like driving Fords, but the Explorer was really nice. Pretty much like the Trailblazer, good power, really comfortable inside.
I probably forgot some but those are what I can think of....the Envoy, Trailblazer, an Explorer are all very nice I think when compared to the others. Obviously I dunno bout insurance or mileage, or maintenance, but for driveability, thats my input. Dont get a Durango!!! Theres much better cars to get.