Simon,
For a nice, natural sounding solid-state amp, you might want to consider the Channel-Islands VMB-1. I own a pair of these relatively inexpensive solid-state mono-blocks and they are very good, even spectacular considering the $999 list price. And they come with a generous return policy.
There are some comments about them on the AudioCircle web forums.
I really like them. They are 40 watts/channel, small and generate almost no heat. They are a similar design to a GainCard or GainClone amplifier. These are sometimes also referred to as "chip amps".
I have currently replaced a series of tube amps with the CIAudio VMB-1s and don't miss a thing......
Enjoy,
TIC