Then they say something giberish like " in class "A" single ended the sttaf will only need 15 watts, but these amp are generally quite expensive for a good design".
Not giberish, but valid comments you really should consider. Single ended tube amps are a very very special breed of amps.
I use a 12wpc single ended (class A) tube amplifier on speakers with the same ratings as your Sttaffs, and it seems your Sttaffs are tube friendly also. My 12wpc single ended amp has more than enough power to pound down the walls. I have used many push pull designs over the years but not one come close to the magic a single ended tube amplifier can achieve.
If you do some searching on Audiogon you'll find a couple of single ended amps for sale that will fit you bill. You will not be disappointed.
Regards
Paul