i've never been fond of vandy's, always liked the thiels - for pretty much the reasons already stated above. so, if it were me, it's a no-brainer decision. however, if *you* really like those vandy's, i'd make sure ya had an opportunity to audition the thiels in a familiar setting.
regarding 3.6 vs 7, i'd suggest a pair of the 3.6's w/a dedicated subwoofer set-up - a pair of good subs, outboard electronic x-over, & decent hi-power s/s amp. more bang for the buck, imo...