You will need more power than the SLI-80 can produce to effectively run the Quads. The Gershmanns would be a good choice as they are very efficient. My room has similar dimensions. I had run my ProAc 2.5s off a 55wpc tube integrated (similar to the Cary) and found the simply wasn't enough power. I would recommend the Triangle Lyrr (new $3k), Audio Physic Virgos, Alon Lotus, JM Renaud Trente and Silverline Sonata based on your music preferences.
