I got a hit on this site whilst searching for information on B&W Signature 7NT speakers and have been grateful for the advice people have contributed in other threads.

I have an amp question for anyone experienced in these matters.
B&W recommend that an amp with 150W power be used to drive these speakers, which seems like a heck of a lot given a lot of quality amps are in the 75-100W range for 8ohms speakers.

I have a choice to drive my pair of 7NTs with either:
My Sony STRDB940 AV amp (110W per channel) or by a specific stereo amp such as the Roksan Kandy K2 with a nominal output of 125W which I'll have to buy.
Also, if I use the Sony amp, I'll need a replacement AV amp with an equivalent power rating for my home cinema.
Do I take the audiophile route and use a dedicated stereo amp at twice the cost of a decent AV amp (currently some excellent deals here in the UK) or should I save the money since iTunes decoding will be the limiting factor on sound quality compared to the rest of the kit?

Thoughts much appreciated.