I’d say that any half decent AV Amp/Receiver would be wasted on those speakers. An AV amp will generally want to run 4 ohm speakers IIRC. You may also have the problem that all in one systems more often than not use Passive Subwoofers where your box will power the sub. AV amps run Active Subs that contain their own power source and amp.
Don’t know what your budget is, but it may be worth considering something like this Yamaha ‘one box, but actually genuine seperates’ deal from Richer Sounds @ £350
Yamaha AV67
I have a mid-range Yamaha AV Amp that’s around 3 years old, with a Kef Speaker system and it sounds fantastic.
If you need to spend a bit less, then there’s this Onkyo system for £300 – Onkyo generally get good reviews and are usually a quite muscular sounding Amp.
Onkyo 3305
Or a bit more would get you this Onkyo for £400 – with both you get the advantage of being able to handle HD sound codecs.
Onkyo 6305
Search for reviews and something will usually come up on AV Forums or similar