Schiit Ragnarak may be good leaving you money for other nicities. I think it’s about $1500. Most have given it good reviews. 60W @ 8ohms should be enough to run your speakers.
The Parasound should sound good with the B&W as well. More power with a warmer sound.
I couldn’t find the impedance curves for this speaker but I would find out before you go with a tube setup. Some B&W have crazy impedance graphs.
Maybe you could afford a sub with money left over.