Good bookshelf speakers for a MC240 tube amp???

I have recently inherited a McIntosh 240 tube power amp and C20 tube preamp - both are in the shop now being tuned up. So now I'm looking for a pair of bookshelf-sized speakers that will match up well with the Macs. The system will be in a small carpeted room (~10'x10') with about 7 feet between the speakers. I'd like to avoid using a sub. Listening primarily to rock and jazz (new & old) - on vinyl and cds. The MC240 is rated at 40 watts per side.

My budget is $650 max.

I'm leaning towards a pair of B&W 685's since I've seen plenty of good reviews on them, but not sure if they would be happy with tube power. I don't imagine that I'll have an opportunity to audition the speakers with my amp, so I'll be going on reviews that I read, and suggestions from folks on these boards.

I really appreciate your input!