I did it! Last weekend I bought a sofa! Actually...Brit and I bought two!
I finally decided that Ikea's Karlstad in Sivik Dark Gray was the one. After sitting on countless other sofas (including the long time front runner Room and Board Jasper) I decided that this one feels just as comfortable and looks almost as good as much more expensive sofas, at such a reasonable price. They were delivered yesterday (although I haven't actually gotten to see them in our new apartment yet)...but I'm very excited!