Just to mention, much is conservatively rated, i.e. my SS MC2250 was rated at 250 wpc, but tested within spec at 305 wpc by McIntosh at a white coat lab day at Harveys back in the day
so, maybe check out 250 wpc tube stuff as well,
what impedance are your speakers?
IF you consider bridging amps to make a pair, often the impedance choices get limited.