i dont really think the gs series looks all that great personally.
i sat in the new IS and it is nice looking outside, but that car is really too expensive for a car with only 85.7 cubic feet of passenger volume inside.
i had a g35 coupe, and the rear leg room in that coupe is actually MORE than the is350/is250. is250 is too small, its smaller than the new civic inside i believe.
the gs is nicely sized, but i'd have to say the rear looks sort of funky.
m45 rear looks a little odd, the taillights are very large, the g35 interior is well.. pretty down market.
i tend to like the acura cars , but they are all fwd except the RL. i actually love the new RL, they seem to be fairly cheap too ~41k or so. and are fully loaded.
i guess there just are A LOT of very good cars out right now, competition is great.