W00T! W00T! IT'S ALIVE!!!
Picked up parts on Friday night. Built PC Saturday. Spent Sunday setting up Ubuntu, drivers and cgMiner. Monday night started mining!!
I'm pulling an avg. of 597.1Mh/s on the single card. Was above 600 initially so I gotta figure out what's going on...
According to OzCoin I've already collected (in about 3 hrs):
Pending Payout (confirmed): 0.00456259 BTC
At this rate it'll take me a month to produce 1 BTC (AUD$33)

which is a target of mine where I'll re-evaluate my plans on Bitcoins and what to do next.
This is a little off-topic but have you taken into consideration that you might not make that much with that rig after ASIC is "fully" deployed?
...
You might be better off buying $2000 worth of BTC and hoping they go up.
Just saying...
As I've mentioned:
P.S: I know I might be a little late with the GPU mining, but I'm not doing this for the money. More for fun and research. Might use the PC for a gaming PC after a year or two.
But the foremost reason I'm getting into Bitcoins/mining is it's revolutionary concept which I felt drawn to. but this is an another subject and I shall not digress
At this point I don't know if I'll get 3 additional 7970 cards to put in. As soon as I started cgMiner, the Fans and Heat started pumping. Which I expected but don't know how long I'll live with it in the same room, especially in summer (garage might be the go). and the $1500 can be better spent on single ASIC miner as deathcode pointed out. I'll see how I go, but the ASIC miners don't sound fun. They just plug and
play run...
QG