Which preamp to pair with Moon W5 amplifier?

As I said earlier, I have the Sim Titan, and never had ANY lack of the QUANTITY of bass, though it was not as tight and punchy as I wanted - UNTIL the VAC pre was added. It actually added even more depth and extension, while also firming up the bass that the Titan provided. I think this is a direct advantage of a tube pre with a transformer-coupled output design - it adds the tube mid-range qualities without sacrificing bass or treble extension, and the input impedance of the amp is far less critical.

That was after trying the Pass X2.5, Placette Active Linestage and a PSE HL-1 tube hybrid. They all seemed really good overall, but also just left the Sim with its standard bass characteristics - deep, sustained and sweet, but a just smidgen loose.

** Here's A Question for you all -

I have been wondering if, for the 2-channel listening and overall impact, would W-6 Monoblocks notably improve on what the Titan offers without changing the overall Sim 'flavor'? .....Or is it just an extra couple of power cords I have to buy.....

Any comments about the W-6's? PLEASE !?!?
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Hello,
If you can get your hands on the P5 they go together like hand in glove! Prior to buying it I used a Proceed Pre, Classe DR6, Plinius CD LAD, and Audio Research LS15. All of them sounded pretty good because the W5 is fairly easy to mate up with. But the P5 sounds like a Krell, Levinson, and Rowland combined in one. It is built like a tank. The only negative thing that I would say is that the imbillical cord from the separate power supply is not long enough!

Your electronics outclass your speakers by a large margin. If you're looking for more midrange liquidity - I would take an encompassing look outside of B&W.