Any issues to your console is covered by the 1 year manufacturing waranty. Xbox 360 as all educated us on the process of getting a console replaced.
While I get the need to wait, the excitement of a launch is pretty awesome.
What I'm saying is, why wait? Are you just going to play your ps360? It's pretty awesome owning a brand new system. It becomes "your baby". Much like my tv when I bought it.
The thing is, sure you can wait, but why? So you can see the clear winner? Rationality is not fun, it's boring. Anyway, good luck with whatever console you do purchase (ifn you decide to) I'm sure there will be plenty on shelves in a week's time.