Those that say "wait for the 2G" assume that the 2G version will be more desirable than the current model. That is a subjective decision however. I know that some people were sorely disappointed by the 6th gen Nano with its square screen, lack of camera, lack of memory, lack of video playback, etc. and went scrambling to find a 5G model.
The same was true when Apple released the version of the Shuffle without onboard controls.
The current model iPad is surprisingly solid for a 1st gen device. If the 2nd gen includes dual cameras and other hardware changes that introduces the risk of defects. There have been many reports here about the manufacturing defects on the latest iPod Touch with light leaks, clicking audio on recorded video, etc.
I recommend buying the current iPad model now, enjoying it, taking good care of it, and should the 2G model prove to be of equal or higher quality, then sell your iPad and put that money towards a 2G.
Of course if you can go without an iPad for 4-6 months then wait for the 2G to be released, read reviews on it, and make a decision then.