I like the A3 a lot (diesel or otherwise), but the lack of a manual + quattro option, kills it for me.
I'm stuck with a really expensive slushbox/quattro or a manual/FWD...at which point, I would certainly buy a GTI instead.
Prior to this year, I would have given an extra point to the Audi for style and interior....but the MkVI GTI addresses those needs nicely.