There are no new processors coming out that are really worth upgrading to until Nehalem or the 45nm Hi-K Phenoms.
And in case you haven't heard about the HD 4800 series. Google HD 4870 vs 9800GX2 benchmarks. Release date is June 15th - June 20th.
I want to be able to OC my computer to 4Ghz on air, is the Q9550 able to do it yet or do we have to wait for another CPU? When do they usually drop prices on CPU's as well?
I sincerly doubt it with air cooling. Intel are really limiting the multipliers on the 45nm quads. The Q9550 has a 8.5 multi. If you really want better performance and you are a gamer, get an E8400/E3110. But even then you wouldn't see that much of a performance gain as modern games are much more GPU bound.