Recommendation for Music/Movies - B&W, Paradigm...

Hello everyone, I'm new here. I've been trolling for ages, but finally registered, and this is my first post.
Can someone please recommend me a speaker with-
fast, yet weighty bass
clear midrange
and class-leading treble resolution
the impedance curve should be somewhat high near the upper mid-bass and
therefore I'm looking for something a little bright but not sharp, forward, but not forgiving.
It's to be used a maximum distance of 12 feet away, for movies (50%) and music (50%). Source is a HTPC or Oppo BD-83, amplification is Onkyo TX-SR707 ( 4 ohm speakers are out of the question I think ), but if the speakers are really worth it, I might add a beefier power amp to the equation...
-Hopefully from a product line that makes good center, rear and surround speakers, which I might want to add in the future as the budget allows... [ but this is not extremely important ]
-No room treatment
-Very odd shaped room :(
-It should be able to play loud without any distortion, and more importantly, excel at low listening levels 70% of the time I won't be able to crank it as I'm in a second floor apartment
-I also don't want to have to park my butt in a single sweet spot the whole time just to enjoy the music, but in the end this is a small sacrifice
-Not sure if I should go with a bookshelf ( B&W 705, 805, Paradigm S4) with a sub or a floor-stander ( B&W 804, Mythos STS or even Focal 816V etc )
These are some of the best reviewed pieces of kit I've seen. I don't have the opportunity to audition. I also notice that the B&W series usually gets snapped up very quickly here on Audiogon, that's more significant to me than most of the reviews I've been reading the last couple of months. They seem like a 'safe' choice, and with resale value ( I'm a foreign student who has a maximum of two years left in this country) I don't have any speakers yet, I've been putting this system together for a while and in a few weeks I'll be ready to go, hopefully.
I am at the $1600 mark, I don't know how much more I should save up because the rest of my electronics are 'mainstream'. I've been eating Ramen noodles since January to save up this much, please help me make the right decision!