So here's a crazy thought.
I wonder if it's possible to configure a rig so it's like an appliance...the goal is basically to have it be a space heater during winter...which also churns out bitcoins occasionally.
The closest thing to that would be the reference (blower) versions of the high end GPUs. 7950s/7970s/280x/290/290x. They would all serve as very good space heaters.
If I plan to get more serious about mining, it sounds like the USB ASICs are the way to go rather than investing in AMD GPUs solely for mining. Is that right? Are the ASICs flexible in terms of being able to update them to work with future currencies or do they only work with a fixed set of existing currencies?
Scrypt mining is still relatively new and extremely profitable, unlike Bitcoin mining which is only profitable for powerful and efficient ASIC miners. Scrypt ASICs are coming very shortly, although they will not offer a significant advantages like Bitcoin (SHA 256) ASICs currently offer in comparison to GPUs. However, they will have a much higher hashrate potential as well as much lower power consumption.
ASICs are not nearly as flexible as GPUs. A scrypt ASIC can only mine scrypt based coins, a SHA 256 ASIC can only mine Bitcoins and other SHA 256 based currencies.
Sorry I couldn't be of much help for your previous questions.