The MS speakers are indeed a fantastic five-star buy, though they are on the party-animal side of the sonic spectrum, so aren't to everyone's tastes.
They and five other pairs of £100-£150 speakers are tested in our current, December issue - the winner of that test is the Tannoy Mercury F1 Custom, which are excellent for the money.
I'd also consider the Wharfedale Diamond 9.1s - like the Mordaunt-Shorts, these are five-star stunners for £150, but have a gentler tone than the MSs.
Finally, consider the Monitor Audio Bronze BR2s (£200) - the Onkyo is more than capable of driving these pricier speakers, and you'll be rewarded with another step up in refinement, detail and drive from the cheaper speakers.