If I needed to build a new PC now, I would get 2500K, 8GB cheap G.Skill, MSI P67 board and MSI GTX560 Ti.
As for SSD, buy one, now. I bought an OCZ Vertex 2 120GB last year for $220. Best money I ever spent PC related. It holds the OS and my commonly used apps. Games and media are installed/stored on a 1TB WD Black HD. I used to have the games on the SSD, but they used up space quickly and there was little gain in load times compared to the regular HD.
For a power supply, I recommend Cooler Master Silent Pro.
Also, even though I'm not into overclocking, I went with a Zalman CNPS9900NT. It keeps the temps low on my quad core.
