On reflection, digitalmonkey's right. A good £900 amp will almost certainly sound better than the C370/270, unless you *really* need those 300watts.
However, I disagree about not wanting to outclass the rest of your system... If, like most of us here, you have longterm upgrade plans, there's nothing wrong with buying a component (especially an amp) that may seem a bit like overkill compared to the rest of your kit. It just makes the prospect of upgrading the rest of the system that much more tantalising.

And I think you'd be surprised how much difference a top-notch amp can make to a seemingly lowly pair of budget speakers. Personally, if you're going to spend more on one component than the rest, I'd do it on the speakers - a budget CD player and amp plus a really topnotch pair of speakers will sound *so* much better than the same system with budget speakers... (Although some high-end speakers are a bit demanding when it comes to amplification, and may not sound very good at all, so it pays to audition.)
HTH,
Dunc