The Beresford Caiman has both fixed and variable outputs so is quite capable of driving active monitors.

There are some excellent active monitors in the pro-audio arena at very keen prices. I referenced a few in the 'Budget Active Speaker' thread. Don't be put of by the fact that they have balanced inputs. All you need is a pair of RCA to XLR adaptors and you're good to go. This is certainly a simpler route than messing about with a full size separates amplifier. You get a lot of performance for your money.

The Cambridge Audio and KEF units you mention above would also be fine. Frankly, at this price point you have a huge choice of amps and speakers and there are not many bad ones.