On board sound processing - most podcasters don't need any processing much less on board processing. The number one action I take to get people to clean up their audio is to get rid of their gate/limiter/compressor rigs. The one processor I like is the dbx 286s, but only for the gate.
Multimix 8 - Uses rotary faders instead of sliding faders. It's not a bad mixer. The Multimix USB 2.0 (with multitrack USB) is probably discontinued.
Behringer X1222USB - I consult with MANY people who use Berhinger mixers. Not one has a hiss problem.
Behringer USB Outputs - Some people claim to have problems with Behringer USB, but I never have, and I have worked with a LOT of them. The Behringer USB A/D converter uses an excellent chip. It's the same circuit as in the UCA202. Check online reviews.
USB Audio Devices - The devices can be renamed in Windows 7. Not a problem.
Aux Sends - Every professional broadcasting organization uses mix-minus for telco, Skype, ISDN, BlueBox. Internet broadcasters usually create mix-minus with aux sends and subgroups.
It appears you're using an AKG Perception condenser mic. Most Internet broadcasters need to stay far away from condenser mics.
All that being said, you're doing what works for you, and that's great. However, most of us here disagree with much of your advice. You're welcome to have an express your opinion even though it's contrary to ours, but a little consideration for the opinions of others will go a long way.
Even though they're cheaply made, I recommend Behringer mixers. The value is tremendous. I use a Presonus 16.4.2, but most of what I do with that $1500 mixer can be done with a $350 Behringer X2442USB. Mackie is my second choice. Since we use a lot of external sources (multiple Skypes, SIP, Google Voice), we use a lot of aux sends/mix-minuses. I can create 8 on the Presonus.
