I wouldn't invest in any GPU mining hardware unless they can pay themselves off in about 3 months.
Even if they are delayed, ASICs are coming. The cheapest is the BFL Jalapeno which should provide approx 3.5 GH/s on a fraction of the electricity a GPU uses. Combine that with the reward-halving that will occur in December and I don't see how you can pay off new GPU hardware as difficulty skyrockets, unless you have access to free electricity.
I'm in pretty much the same boat having just gotten interested in bitcoins. For now I pre-ordered a Jalapeno and decided to just mine what I can using my gaming rig (~280 MH/s) until ASICs are released and more info is available.