I'd be a little hesitant to suggest T-amps with your ProAc's, I fear the resulting sonics would get too "zippy".
If you have to though, I second the ARC recommendation.
I realize it may be a few dollars more, but Plinius SS amps sound very good. Maybe wait another 6 months and save up a few hundred more dollars. I don't think you would regret the decision, and good SS like the Plinius hold value pretty darn well. I've seen the older versions quite often go in the range of $1500. I'm not sure how much your budget is though.
Bryston would be another decent choice, but outclassed a
bit by the Plinius.
When I got my first "hi-end" Bryston amp, I had to save for a year to afford the preamp, so the amp just sat under the bed. That was a rough year.
Disclaimer: I don't own any Plinius amps, I've just heard them and feel they're donically up there towards Rowlands but with a easier to digest price tag.