Hi Harris4cma,
It may be that very few people have heard the FS Ketema. Neither have I but if you have found good synergy between it and the Simaudio integrated, your system will most likely sound better with separates. The advantages of separates that come with individual power supplies, chassis, isolation and higher quality parts will improve the sound as will the added watts. 16k is a lot of dough but the Ketemas deserve it. JMHO.
Cheers!