HELP

In a room that is 12x14, the Profile 918 is perfectly sized (you did a great job there) and you should have very good bass extension and weight.

I also feel the Jolida 302B would probably be the best choice from the list and (I have to disagree with Robr45) that you should have excellent bass with this amp. I have heard the 302B a couple times with different speakers in larger rooms, and I had a 202B for a while in my house on my Focal 926s, and those Jolidas will put out excellent bass as long as the volume doesn't go too high. But it sounds like you don't listen loudly anyway and with a 12x14 room, you shouldn't run out of any power to get satisfying volume levels either.

Plus, down the road you can get a fancy set of tubes for this amp and make it sound even better for little more money! That tube amp with your 918s should sound excellent. It gets my vote and might be what you are looking for.

Arthur

I owned the NAD C-352 while waiting for an amp and thought the 352 had a very warm, pleasing sound. Expect the 372 would have a similar nature with more oomph.

Very nice speakers. They are very efficient but also very revealing. So, while the Cambridge receiver may be able to drive them to relatively high volumes, the speakers are able to translate to your ears the fact that you are using a budget HT receiver lacking the nuance and detail of better electronics. In fact, the Cambridge 540A integrated amp would probably provide noticeably better 2 channel sound than the 540R you are currently using because the 540A has many fewer circuits to color and clutter up the sound.

I agree with the previous posts and for the amps you list, the Jolida would be my first pick and then the NAD. But I would try them both since you never really know what will sound best until you have listened to the whole system together including your computer source. Another thought, you may also want to try the Cambridge 640A, 740A and/or the Rotel RA-1062. Those will be within your budget and are all decent sounding little high current amps.

You might also want to spring for slightly better speaker wires. 12 gauge wire from Blue jeans cable dot com, or bulk stranded or solid core wire from Audioquest would provide a relatively low cost improvement over what you are currently using.