IMHO, when it comes to interfaces, working is the most important thing in the world. Features, preamp quality, bundles, etc. all take a backseat to simply working.
I know around school, I've seen far more problems with MOTU gear (especially driver/configuration related) compared to Echo, and while there are relatively few Echo users (I know one Layla3g user and 2 old Mona users) I've never heard problems from them.
Of course, this is from the guy who just adores his E-mu.
You ask which interface will fit you better...well, get the one that works. Find a dealer that will let you return a sound card if it does not jive with your system (My local Sam Ash is nice about it, and online American Musical Supply is cool as well). If it works, then it works, and you are set.
Oh, I have dealt with MOTU for their software products and I too have had bad experiences with their tech support...