If you're set on tubes and are looking to inject a little warmth into your system I'd say the Rogue is defitnitely worth looking into. If you're looking for a more neutral sound I think you may do better elsewhere.
I've been playing with a Marsh P2000 recently that is really impressive, and at only a little over $1000 I'd say it's a screaming bargain and competes with units many times its price. It flushes out tonal colors completely, conveys detail very naturally, is dead quiet, and looks great. Marsh also makes a tubed version for a few hundred dollars more that, if it's any better than its solid state sibling, should really make some waves in the audio world(there are a lot of reviews pending for these units, so it'll be interesting to see how they fare). I'd also highly recommend their amps that seem to be more refined than most at their price points, and their 100W offering is only around $1000--bet it would work great with the Paradigms.
You may also consider the Bryston BP25 that may offer some nice synergies with a Bryston amp if you go that way. I'd also recommend Placette preamps that are extremely neutral, and the company offers a risk-free 30-day trial. I also like the Pass Labs preamps, and you can probably find a used Aleph-P at an attractive price if you look.
Those would be some of my top picks, but you should try as many as possible in your system to find the preamp that really works best in your system and for your tastes--it's the only way. Personally I'd get the amp squared away first and then experiment with preamps. Best of luck.