Just to throw out a couple of things...
I use a Rode NT1, and have never been disappointed. However, I have little to compare it to other than an SM58 and a CAD95. The Rode kicks both completely out of the water. I've never used a U87, though, so maybe I don't know what a good mic is...
Are you using an Audio Buddy? (just to make sure I'm thinking in the right direction, the Audio Buddy does not have converters, right... not a sound card?)
What soundcard are you using? It doesn't have 1/8" jacks, does it??!! Any soundcard, so far as I know, that has 1/8" jacks, will probably be one of the first things you'll want to replace. You can run a great mic and a great pre into a cheap card and get less-than-great results.
You're worried about room sound. What is your bedroom like? (no, I'm not looking for an invitation

) I record stuff in my spare room all the time, and my NT1 doesn't seem to be all that picky about my cluttered little carpeted room.
My Behringer ECM8000's, though, are causing me to take room qualities into greater consideration....
With most condenser mics (except omni's.... anything reasonably directional, anyway....) you can get past a lot of the sound of a room by simply close-micing. If I set up my NT1 at the far side of the room (9' away

), then it will pick up a lot of my "room sound." (such as it is...) If I sing into the NT1 from about a foot away, there really is no problem.
Chris