Any idea of what you do want from the amp and what you must have it do?
Are there certain requirements that have to be fulfilled?
The options are rather limited right now:
Denon AVR 2309 £450
Sony STRDA2400ES £430
Pioneer VSX1018 £420
Yamaha RXV565 £415
Yamaha DSP-AX861SE £300
Onkyo TX-SR606 £350
and the Marantz as mentioned by Tone-UK.
If you have a Blue ray Player or plan to get one, it's decoding capabilities can make a difference to amp choice.
The Maranz 5003 uses audessy room equalisation and can't decode bitstream HD audio
and run Audessy at the same time; you can send it decoded LPCM from the BR player (if it can decode all formats) and Audessy will then still work.
The Maranz 4003 uses Marantzs proprietary MRAC instread of Audessy. I don't know anything about it, so don't know if that has that problem or even if it does equalisation --- something to check out.
If you go for the Yamaha 861 you need a BR player that decodes all HD formats
and will
force 24fps if you have or intend to get a 24fps capable TV.
I don't know anything about Sony, Onkyo and Pioneer in this regard but I believe the Denon will decode HD audio and run Audessy at the same time and has no problems with 24fps 1080p video.