Let the hive mind of Engadget get that for you.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
If you want power you gotta pay for it. Specifically the the ability to have 10 Extenders running on your system or to have more then 4 cable card tuners. The only people who offer that ability right now are Niveus and Life|ware and their systems aren't cheap. Starting at about 5000 may still be to low. If you want to fill your house with the ultimate A/V / Home Automation system you have to be willing to shell out some bucks.