I know this is most unhelpful, but the answer to your question is - any speakers that you like, that you can afford.
There are probably a very few hard to drive exotic speakers that you might have trouble with, but other than that, the field is wide open.
More than anything we need your budget.
As to cables, even with a very expensive amp like this, I don't recommend the expensive premium speaker wires. Speaker wire of a size of 2.5mm² in the price range of £1 to £3 per meter is fine.
Though, if your speaker wire runs are short, it is not going to cost a fortune to get better cables in roughly the £5 per meter range. Though I doubt the benefits, we are only talking £20 here. That's not much compared to a £2000 stereo system.
As to interconnect cables, well, you've got an all in one system, so you should need few of those. I recommend mid-grade; not the cheap stuff, but not the ultra-expensive stuff either. You'll get he most and the best for your money in the middle of the pack.
Give us a budget on your speakers, and we can better comment on that.
Steve/bluewizard