What additional components

[meem]

Hi,

I've just ordered:
Asus P5K-E WiFi Intel P35 (Socket 775) PCI-Express DDR2 Motherboard
Intel Core 2 Quad Pro Q6600 2.4Ghz


From my previous computer I have-
Akasa Paxpower 400W Ultra Quiet PSU Black v.3 - ATX 2.0
BFG 8800 GTS OC 320MB DDR3 DVI PCI-E Graphics Card
Creative Sound Blaster Audigy SE 7.1 OEM PCI Soundcard
Thermaltake Soprano Silver Middle Tower Case
Zalman CNPS7500-ALCU CPU Cooler (Socket 478/754/939/940/AM2/LGA775)
Seagate ST3250823AS 250GB 7200RPM SATA/150 8MB Cache - OEM


Here are my questions
Which of those previous parts will bottleneck the new system if i didn't replace them? If its too weak, what do you recommend?

I need memory also, I don't know yet 2gb or 4gb, value or high performance. What are the views there?

It's mainly a gaming computer. I'd like to overclock, to some kind of "safe" middle ground, 3.4ghz or something?

Budget for memory depends what else needs replacing, I have no firm limit, but i didn't plan to spend all that much more.

Thanks for the help

(edit) Oh one final thing, i am ok with running either 32bit or 64bit Vista - whatever will be best for me

 

[meem]

How much power output should I be looking at? I'd like to look around the PSU's, so having a rough idea of the drain of that gfx, cpu, 1hdd, 2dvd etc will help me know what i can discount

With regards to RAM, what brand/speeds should I be looking at?

Also how necessary is better cooling? Is my Zalman adaquate at stock only, good for only low level OCing, or somewhere midground?

I didn't OC the 8800 yet, any considerations there with fans and cooling if I chose to?

Thanks