kramwest1
has a
The thing with Apple is that when they come out with something new, just buy the previous version and it's just as good, and if you are lucky it might be affordable.
The only caveat I'd add to that is when there is a specific and important hardware feature updated between versions, consider waiting for the newer one. I always regretted getting the Wall Street Edition Mac laptop that didn't have USB ports. Since Apple doesn't seem to be embracing USB 3, I'd take them seriously on the Thunderbolt port, which is why I waited on getting the MacBook Air until it had Thunderbolt (not that there is anything real for it yet, but connectivity is important to an otherwise spartan laptop).
That said though, I don't know what big hardware change there would be on a new iPad 3.