which preamp to buy???


I am in the market to upgrade my current preamp ( Parasound P/HP 850), there are a few options here in my price range $500-600. My system consists of B&W 704's. Aragon 2004,Musical Fidelity V-Dac, Emotiva ERC-1 cd player. Cables are AQ King Cobra ic,Canare digital, and Paul Speltz's anti-cables (ic & speaker).
My room is large and on the bright side, lots of wood and windows, so I am looking for smoother highs and a better soundstage. I do not plan on needing a phono stage anytime soon.
Some of the pre's under consideration are the : Audio Research LS3B, PS Audio trio 2, Rotel 1090, Parasound Halo p3 and the Aragon 24k.
Any suggestions?
Paul
pjnad
My room is large and on the bright side

I would consider treating the room instead of equipment.
Thanks Riley. I've already been thinking along those lines, but it's a problem...while it is our music room, it's also my wife's favorite room in the house...we have beautiful views which she doesn't want to block (hence no window treatments) and a very high wood ceiling...
I'm considering a folding screen with some absorbent material which I would put along the back wall and could be moved when I am not doing serious listening.
That being said, I still think a better preamp is necessary.
Slightly off-topic but I would replace that Canare coax posthaste. Just changed out mine and it's one of those times when you realize you were using a piece of flawed equipment.
Jult52: what did you replace it with? I would need something very reasonably priced?