SET for 88 dB 4 ohm loadspeaker

KR Audio produces a number of higher power SETs, that output 20-100 Watts SET depending on model. I have their SXI integrated on order with 50W output from the Kronzilla tube. I currently have a Ming Da with an 805/300b combo that puts out about 45 Watts and still has a lot of nice attributes of the SET sound -- not the last word, but not bad for the money. Other amps I was considering were the New Audio Frontiers with about 25W and the Mastertone 845 Ref with about 40W/channel.

oops, I meant Mastersound 845 Ref. As a banjo player, I think about the Gibson Mastertone whenever I write mastersound.

The KR Kronzilla DX monoblock has 2 T-1610 Kronzilla tubes in parallel for a total output of 100Watt SET. Here is a review: http://www.enjoythemusic.com/superioraudio/equipment/0506/kr_audio_dx_monoblock.htm
The Kronzilla SX and SXI stereo versions output 50W each.