SS amp to mate with an Audio Research SP-16L

Depends on what speaker you are intending to use with the amp. That interface is far more important than the interface between your preamp and amp. Also give us a clue on your sound preferences and budget. With that you might get some meaningful answers.

Well there are quite a number to consider - my favorites, which can be obtained in your price range are used models. I am very partial to Threshold SA3's - a pure class A amp that while it is only 50wts it can handle tough impedences that can be presented by Dynaudio products. Its a very neutral amp without grain or etched highs. I used it very successfully with Theils before I discovered Tubes. My next choice would be the Muse Amps - models 160, 175 or 300 (I'm a tube nut and while not tubish in any real way the Muse are very detailed and err a tad on the warm side, they have excellent bass and current delivery - they should match well with the Dynaudios. I use the 100 model as my summer amp for casual listening to avoid excess heat and I really don't miss the tube amps UNTIL I TURN THEM BACK ON).