Hi,
Actually its not as power hungry as other in the similar price range

!! The sensitivity of 89dB is very decent as opposed to 86/87 average ! so what I meant is if you have an Amp with good current capability then you are good to go

!
Ohh so you are opting for 2-1,The very same speakers have been reviewed in what-hifi with a 5 star rating,not that its something to go by (I personally don't care much bout these,but just in case you care).Also just a quick google for some reviews shows a all 5 star rating of them in all of them !!
In the same price range the other options include the range from Usher,but you have to settle for a stand mount in the same prize range as Opus2-1 !!
Coming to the Wharfedale lower end range, Well I have to say its perhaps your point of view (there's nothing wrong in that), But what I have noticed over the years (having heard all the series of Wharfedale) is that they are
THE value for money products and have always fared very decent in terms of their sound reproduction !! Take Diamond 8.4 for Example,They sound soo good for the money that it becomes very hard to beat them ! at times when I've compared them with doubly prized speakers they've come on top with the sound !
Yes they may sound coloured when you compare it with x3 times or more priced products

! but compare it with the run of mill speakers from almost all brands in the same price range (even as said double at times) you'll appreciate their sound

!!
Regards.