Tomryan is right. For many years, ARC and ProAC were showcased together at various audio shows. More than a few people have praised the synergy between these two. I heard this combo at CES 2003, and while it didn't float my aircraft carrier, I think a lot of the blame can be placed on poor show conidtions.
I'm currently enjoying a Bel Canto SET40 powering my ProAc 2.5s, so you might consider Bel Canto's SETi40 integrated. It's a discontinued model which orignally retailed for more than $5k but you may be able to get one for around $2500 or less.
Other tube integrateds I'd consider are the Primaluna Prologues ONe and Two or the VAC Avatar Super.
Have fun!
I'm currently enjoying a Bel Canto SET40 powering my ProAc 2.5s, so you might consider Bel Canto's SETi40 integrated. It's a discontinued model which orignally retailed for more than $5k but you may be able to get one for around $2500 or less.
Other tube integrateds I'd consider are the Primaluna Prologues ONe and Two or the VAC Avatar Super.
Have fun!