Agreed! The BeoLab 6000s are fantastic for their size, but I'd only get them if I really absolutely 100% had to get something which visually 'disappeared' or something which meant I couldn't use any other speakers from the range. BeoLab 4000s are sonically better, as well as being cheaper and offer more placement options.
BeoLab 3s and 8000s are also fantastic speakers, or if you find a pair, BeoLab 4500s or 5000s (panel speakers) also produce a fantastic sound!