Some time ago, I auditioned three amps with the STs; the CJ CAV-50, Densen Beat 100 and Mesa Tigris. If you can find one, the Mesa Tigris is the best sounding amp out of them all. The Densen is a close 2nd.
Proac sounds great with the ARC line. I have Proac Response 1SC's with an ARC CA-50 integrated (about 45 watts per channel) and am in heaven. The ARC integrated sells for about $1500 used on this site. Note: it is a tube integrated, but I recommend it anyway, for Proac.
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