I am using the Conrad Johnson CA200 and its one of the best amps I have had the pleasure of owning. I also tried the Lyngdorf TDAI2200 which is a superb amp but ended up buying their preamp with room correction to connect to my existing power amps.
The CA200 is super detailed, transparent and unless you have a very large room it can drive most speakers. Certainly does a great job with my SF Amati's.
