OP
I too amin the camp of Tube Pre and SS Power amp. The trick is the synergy of the Pre to the Power and that is where one will spend time tweaking.
my advice is, if the Pre is sweet /analog sounding, then a power amp that is no signature, just power and can Control your speakers.
If the Preamp is a bit detailed but a touch of Tubeness, then your Power must be Class A type power amp with which brings about some sweetness but can control the speakers
YMMV