I've been in your situation in almost the EXACT same size room. Lots of good advice so far. I did a lot of trial and error, but the best results that I achieved were with a pair of Aerial Acoustics Model 5s on the long wall. I used the Audio Physic speaker positioning suggestions and the results were nothing less than stunning. I drove them with a Classe DR-9/DR-5 combination. Ported speakers and/or those with any significant amount of bass will drive you nuts. I believe that this is why the Aerials worked so well...sealed enclosure with not much bass below 70Hz. My musical tastes are also similar to yours and it was very satisfying. The second best speakers that I tried were the Magnepan MMGs. The 1.6s (which I also tried) were just too big.
Best of luck. It can definitely be done, but you'll have to be very careful about speaker selection. Luckily, you've got a great resource here on AudiogoN.
Best of luck. It can definitely be done, but you'll have to be very careful about speaker selection. Luckily, you've got a great resource here on AudiogoN.