Another vote for GIK Acoustics here. I put up 8 244 bass traps and 3 242 traps in my small 11'x13'x8' room and it's made a dramatic difference in not only tightening up the low end, but the imaging and clarity is much better. I'm hearing things (good and bad) that I haven't heard before in recordings that I'm very familiar with.
The owner Glenn is a great guy to deal with and spent a long time with me on the phone to figure out what I needed. (he actually talked me into buying fewer traps than I originally thought I needed!) His prices are very reasonable as well.