Well, if you were in France I'd say listen to Focal. If you were in Sweden I'd say listen to XTZ. If you were in the UK I'd say listen to KEF. If you were in Italy I might recommend that you listen to SVS subwoofers. I didn't mean anything accusatory by asking. I apologize if I was too assertive.
Anyway, Good sound comes from good speakers. That's where the bulk of your money should go. Rather than spreading your budget thin to get 7 mediocre speakers, you'd be better off devoting more money to the front 3. Your Q Acoustics choice looks promising from the couple of subjective reviews I've read, but I'm having trouble finding any measurements of them anywhere. They look small, and I'm concerned that you might have to set your subwoofer channel's low pass filter at an undesirably high frequency to blend with them. Are the KEF Q300 and Q200C (or used Q9C) available at a reasonable price in Belgium?
For the subwoofer, check with BK Electronics in the UK and see what it would cost to ship one of their
ported Monolith subs to Belgium. One of those would outperform two of the Wharfedales I think. You'll definitely get far better infrasonic extension (sub-bass below 20Hz).
I'm really not clear on the speaker selector thing. What do you hope to gain by using a speaker selector? Are you planning to have speakers in different rooms, and to use the selector to choose which room makes noise? If so, you'd be better off looking for an AV receiver with a Zone 2, and planning to re-use one of your Lepai amps to power the second room. Either that, or a pair of JBL LSR305 powered monitors would be a nice choice for a Zone 2.