Upgrading - - recommendations monitor speaker?

well upgrading might not be the appropriate word but maybe resizing will :p

what i have now : Mirage OM-9 2 times.. Mirage BPS 150i
drivin the OM-9 with my Bryston 2blp pro amplifier!

this is my personal room setup ..
used mainly for music/movies/games from my HTPC

what i would like is to go with a smaller studio like pair of speakers coupled with a different subwoofer..

first reason is that i've been trying to accoustically treat my room and there is just nothing that i can do that will give me a really good sound
then the OM speakers are going in the living room for home theater with a new TV :)

i would like to have recommendations on a really really really good pair of monitors that i could use for myself..

i need something that will play somewhat loud and still give me a great feeling from the larger sized cabinets..

will be powered with the bryston 2b for now..maybe i'll updgrade amplifier later on!

i am not afraid to buy used.. i have a budget that range into the 600-800$ USD for the pair and maybe 300-500$ for a good musical subwoofer!

thanks for your time and input! :)