Good small HT speaker for in cabinet

I am looking for a pair of speakers (and center speaker) to be placed in a cabinet. The speakers will be used for hometheater only and may not be higher than 8,5 inch and must be available in black. My room is 25x15.

I was thinking on M&K M5 but these are very difficult to find in Belgium. I also like the Proac Hexa, but these can not be found anymore.