I have been using OpenSuse for a while but it is a bit fussy about proprietary drivers. That is, it will install a open source driver even when a better proprietary one is available.
You may agree with that, but I lost patience with my latest update of Suse when trying to re-install a driver from NVidia was a complete foul-up, and judging by the OpenSuse forums I am not the only one with the problem.
So I am currently trying Mepis (11.0), who's motto is "It just works". It tends to be touted as a beginners distro, which has put me off, and indeed some aspects of it are a bit too simple for what I am used to. Eg the install tends to put most stuff in one partition, but I can sort that out later.
But as they say, everything just worked. It even put in the right printer driver - goodness knows how as the printer is across a network and switched off at the time.
A huge time saving compared with Suse [and see interesting discussion right now at at http://www.linuxformat.com/forums/viewtopic.php?t=14740
I always prefer a distro where KDE is its native desktop. You can put KDE on Mint, Ubuntu etc but I feel that a native KDE distro will have given it more tlc.