I threw another $150 on top of what you just mentioned for a mixer, handful of cables (mostly RCA to headphone and 1/8" to 1/4 adapters), and 2nd sound card.
Between the 2nd sound card and the ability of (some) applications to direct the sound output it allowed me to get a little creative.
I could have things being heard but not broadcast. I could mix together everything before it went out. I never had to rely on anyone to tell me that this was too loud or this was too quiet, since I was listening to everything on the headphone-monitor port of the mixer. Everything was just grab a knob and turn (or slider and push) instead of having to open another window on the second monitor and play with the sound settings.
Then I remembered I hate the sound of my own voice. Now I just sound really good on vent. Boy are my levels super precise.
Oh well. 300 dollar lesson, but I still make some use out of the equipment and had fun playing around with everything.
Oh yea, a boom arm and shock mount. Until you remember your physics, you'd be surprised how much noise transfers through all the solid surfaces and into your super good mic. Keyboard typing sounds like your neighbors are getting bombed by a foreign army.
I also found that a standard dynamic mic worked better (and was much cheaper) for my situation than a condensor mic. Sure, condenser mics are recommended for broadcasting speech... for a studio application. Since your house is not a studio, a condenser mic is TOO good. At least this was my case. It could pick up a neighbor's cat farting.