turn&cough, i haven't heard the other speakers you mention, but i own a pair of the proac tablette 8 ref sigs, & i can say these are some of the most amazing speakers you will find, especially considering the size. and, they will play loud w/all but the most bombastic bass-content music. for that, you need to cross them over to subs. i had them in a ~26x38 room, crossed over to a pair of subs at ~80hz, & they would go loud w/o compression, loud enough to blast you out of the room. soundstaging, dynamics, detail & smoothness are really outstanding. they were extremely close to my retail $3300 meret re's in the same set-up. (these are also amazing monitors, but good luck finding a used pair of these discontinued speakers, designed by the same guy who did the artemos eos', & wery similar to them.)
i prefer the ref 8 sigs to the also outstanding proac 1sc's - they're more open & detailed, only giving up a few hz to the 1sc's on the very bottom. (and this isn't an issue if you run a subwoofer system.) they retail for $1800 (unless there's been a recent price increase?), & can sometimes be found used for ~$1200, but they sell almost immediately...
doug s.