I have a simmilar system to the one you described, Sound Valves amplifier (basically an upgraded and modified stereo 70) and an Audio Research sp-6b. I just bought a pair of Vienna Acoustic Haydns. I auditioned probably 30 or 40 speakers over the last year and these are my favourites over all. Cost was about $900 with stands, and I think this is pretty close to the retail price, so you might be able to get them cheaper. good luck.
Good speakers in the sub-$1K range
I have a corporate apartment that I use during the week, and I've brought up some spare equipment that I wasn't using at home anymore. I have a Pioneer PD65/Lafayette tube pre/Eico HF89 Tube (50W Ultralinear)/Kimber Kable. Right now, I have a pair of B&W 2002's, and they just don't compare to what I'm used to at home (Mirage M5si's/Adcom 555II). I've searched the net, and seen what I think are some good speakers at reasonable prices, ie, Monitor Audio 702's for $750, pair of Spica TC-60's at $450, pair of Linn Nexus for somewhere in the $500 range (I think), and I noticed a pair of Snell C's for $750 on the auction list of this page. I mostly listen to classical and Jazz, but I do throw Jane's Addiction in there on occation. Any advice?