preamp suggestions - help :

currently, i have b&w n 804's with the rotel rb1080 - any thoughts on a good preamp? i'm not too concerned with the cd transport - i've considered a few things including the benchmark dac, etc but i'm really having a tough time with which preamp i should look into. i'm open to including a tube somewhere in the chain but i've heard the 804's do really well with SS... -i'm really at a loss here. any input would be hugely appreciated! :)