With those speakers you should be looking at SET amps. If you want a little more bass, as your post suggests, go with an 845. Here's a beauty, given top marks by TAS:
http://www.usaudiomart.com/details/649217914-mint-line-magnetic-518ia-set-tube-amp-845-one-owner-gol...
http://www.usaudiomart.com/details/649217914-mint-line-magnetic-518ia-set-tube-amp-845-one-owner-gol...