ProAc budget level S.S. or Digital amp synergy?


Just assembling this system, into which I would like to interject tubes by way of the preamp stage with my foreplay II (Mullards,BugleBoys), yet achieve the drive and articulate bass charecteristics afforded with S.S, on a tight budjet...

Would some kind A'goners make recomendations of likely suspects, knowing the preferances of these speakers and your experiences with their presentation, which might meet my criteria ?

I realize that recomendations are always asking posters to go out on a limb, so to speak, as I have much more experience with headphones and their amplifiers and make recomendation myself over on Head-Fi...

And yes, I have researched and read what little there is on the subject, although without the inclusion of this specific criteria set. On a budjet, with a tube pre and of the S.S. design hopefully to be bought used here!

Room is 20X16X9 hight...

~Garcia/Dylan/Lightfoot/Taylor/Merchant/John/Hynde/Waits/VanMorrison/Knopfler~

TIA for sharing.

Regards,
finthen
Rethinking a strategy, due to the feeling I'm getting that class D amps, though having the wattage / spl and low cost advantages, will suffer in terms of sonics vs starting out with say a 60watt Bryston in a near field listening configuration.
Which eventually as budjet allows, can be used in a bi-amp configuration (top), buying something similar but substantial in terms of watts/spl driving the lower end, again, fronted by the Foreplay II pre. Eventually allowing for more liberal placement options...

Feedback would be appreciated~

TIA
I've decided to begin the journey here by driving these ProAc 2.5s with a Bryston 2B LP @ 60w fronted by the Foreplay II preamp(Mullards/AmprexBugleBoys), lo-fi Sony ce-595 as transport with the Corda Opera as DAC, set-up in a nearfield configuration. As I say, until my budjet allows for a more ideal amplification solution...

Thanks for all the help guys~
I heard Proac with Jeff Rowland Concentra, Oracle CDP and that was a great match. Later heard the same Proac with Meridian system and the treble got really nasty. It has been well documented that the Response had tweeter troubles that require a laid back amp.
Had the same experience with Monitor Audio / Meridian so I feel pretty sure about the Meridian / Proac combo.
CDC,
I was curious about your statement that the response tweeter has tweeter troubles and requires laid back amps.
I think they are extremley accurate and require accurate amps. They are revealing but I've heard them sound world class with several amps that I would'nt consider "laid back".Including my ARC 300.2 and Manley Snappers.Both driven by the ARC CD#mk2.
A while back, I heard a pair of ProAc 2.5s driven by Ayre gear and the sound was exceptional. I had personal success driving a pair of ProAc Tablette 50 Sigs as well as a pair ProAc D15s with a simple Ayre integrated. I would not classify the Ayre gear as laid back, at all.