Try a McCormack DNA-2 Revision A amplifier and Pass Labs X-1 or X2.5 preamp.
If you have a chance you should audition an ASR Emitter I plus.It's an integrated amp with an outboard power supply, weights 100 pounds and looks gorgeous.
A very musical amp but able to deliver the amperes when needed.
A dealer I know is only selling those and its big brother Emitter II lately. Who hears it buys it.
Of the 3 you list, I like the Rowland the best. I don't know why you prefer the same brand though. There are some strong contenders that specialize in one aspect. Amps for instance, I'd recommend a pair of Clayton Audio M-100 monoblocks. McCormack, as mentioned by Stehno, also makes great amps. Neither McCormack or Clayton has a strong preamp though. Klyne makes some of the best solid state preamps out there, but no amps. I personally don't think you could do better than a pair of Clayton M-100's amps with a Klyne 7LX-3.5b preamp at the $6K price point.
I recently went through an amplifier upgrade quest and ended up falling in love with the sound of Theta Digital amps. A 2-channel Dreadnaught II would fit into your budget, although on the preamp side, Theta is apparently more geared towards multi-channel pres (though you can get a Casa Nova for a song, nowadays). However, given your comments about bass and wanting a rich sound, you may want to audition some Krell amps and preamps. Make sure that you check out the FPB series amps. Krell makes some pretty killer preamps, too. If you go Krell, we're definitely talking used market.
A watt is a watt but most amps are spec'd at continuous power output into 8 ohms. Just as important is the ability of the amp to deliver short bursts of power into lower impedance loads. Naim amps do this very well so they can play as loudly as some amps that have higher continous power ratings. I think they can handle it but you would have to try it to be sure. A lot depends on how loud you want it to play.
Of course you could go with the NAP 500 @ 140 watts, but the $22,000 price tag might exceed your budget.