Memory recommendations for P45 Q9450 system

Need help / suggestions for memory for Asus P5Q Q9450 system. I intend to overclock if needed to improve performance, but not a big gamer. Two setups I'm considering are listed below:


DDR2 800 (4-4-4-15) overclock to 3.2 GHz

DDR2 1000 (5-5-5-15) or DDR2 1066 (5-5-5-18) overclock to 3.6 GHz


Questions:

If overclocking from 2.66 up to 3.2 GHz, I assume the DDR2 800 (4-4-4-15) setup will be faster and would be stable at 3.2 GHz. Yes/No?

If overclocking above 3.2 GHz, will the DDR2 1000 (5-5-5-15) / DDR2 1066 (5-5-5-18) setup be faster than the DDR2 800 (4-4-4-15) at 3.2 GHz? If so, how much more overclocking is needed to get the same performance? Will the difference be noticable for mild gaming use?


Thanks,

Thanks. A couple more questions -

What memory would you suggest for the Asus P5Q deluxe motherboard? Does it have to be listed on the Qualified Vendors List (QVL)? The mushkin 4 GB DDR2 800 (5-4-4-12) 1.8V looks good as far as specs go (fast, low voltage), but it is not on the Asus P5Q deluxe QVL. Would the mushkin work ok on the Asus P5Q deluxe? or should I stick to the QVL?

Thanks. I wasn't sure if I needed to stick to the QVL. I think I will start with 4 GB. Maybe add another 4 GB down the road.