I would agree that for someone looking at Jags, Volvos, and Infinitis that the MS6 isn't what you're looking for. But if you're willing to consider the STi and the EVO as well, then the MS6 could be exactly what you're looking for since it aims to straddle the line between those two groups.
And with deals to be had for as much as $4,500 off MSRP they're a hell of a lot cheaper than an STi or an EVO.
But as long as you're at the Subbie dealer you might as well check out a Legacy GT too.