I disagree with the above post. Stick with your excellent sub. It will make even cheap speakers sound great for HT use which is your intended purpose. Put the majority of your speaker budget towards the sub for HT.
I have 5 NHT SuperZeros in a room 200 cubic feet larger than yours powered by a 50 watt/channel AVR and for movies I have yet to have the volume level over -5db. These little speakers sound really good for movies and also do quite well for music. I have them crossed over at 100hz.
Anyway, that's my plug for the SZs. $100 a piece, and they look great too. Nice high end gloss finish.
Klipsch RF-62II, RC-500, RS-400, SVS PC12+,
Def Tech SC8000
Harman Kardon AVR 1600
PS3, Apple TV, Sharp 70" Qattron