I'd appreciate your thoughts and any changes you think I should make.
A few questions:
1. Would the GA-P35-S3G be sufficient for my overclocking needs?
2. Is the PSU good enough for this setup?
3. Would everything fit in the case ok?
4. Is there anything I'm missing or some other things I should consider, which I have not mentioned?
Yes, the GA-P35 is fine for overclocking. The PSU doesn't look like anything special (>70% efficiency) but I don't know cause I've never used one. One suggestion: look into getting the 8800GTS 512mb instead of the GT since it has better cooling, is usually quieter, and costs only a little more. Just make sure it's the 512mb version and not the 640 or 320.