Building a new Mid Range Gaming / Multitasking PC

hello all , im building a new pc ( without GPU - i have Inno3D 8800GT 512M atm PCI Express 2.0 but using it on 1.0 )

I have some questions regarding CPU / MB / Memory

CPU - I can choose between ( Wont be overclocking)
Q9300 ( 187 Euro)
Q6600 ( 137 Euro)
Q6700 ( 165 Euro)
E8400 ( 124 Euro)
Q9450 is a good alternative but they dont have it in the store yet

MB - I can choose between ( Wont be overclocking)
P5Q-E ( 111 Euro ) 2x PCI 2.0 DDR2 1200/1066/800 ( 16 GB max ram )
P5Q-PRO ( 97 Euro) 2x PCI 2.0 DDR2 1200/1066/800 ( 16 GB max ram )
P5Q ( 91 Euro ) 1x PCI 2.0 DDR2 1200/1066/800 ( 16 GB max ram )
P5E3 ( 151 Euro) 2x PCI 2.0 DDR3 1333/1066/800 ( 8 GB max ram )
P5K3 Deluxe/WiFi ( 124 Euro) 1x PCI 1.0 DDR3 1333/1066/800 ( 8 GB max ram )
I wont be using SLI or Crossfire , but i prefer PCI Express 2.0
Wont be using DDR3 as well for now since its expensive So DDR 2 1066/ 800 would be it
Is it worth buying DDR3 MB ?

Memory
2 x 2 GB 800 Mhz Corsair with DHX Technology (80 Euro)
2 x 2 GB 800 Mhz Corsair without DHX Technology ( 68 Euro)
2 x 2 GB 1066 MHz Corsair with DHX Technology ( 98 Euro)
4 x 2 GB 800 Mhz PQI ( 104 Euro)
PQI seems cheapest but Corsair is a better brand - and if i go with 8 GB PQI ill be going to Vista 64bit

Im playing games at 1280 x 1024

At the store they dont have any Gigabyte MB's so im left to choose only from Asus. They dont have Mushkin as well so im left with Corsair / PQI / Kingston
Im using a Inno3D 8800GT 512 MB GPU , and im not sure about case and PSU ,
They have Cooler Master Extreme Power and Cooler Master Real Power Modular ? Which one should be better?

They only have Spire and Delux , but as far as i know CM is the best around in our country

My suggestions:
Q6600 - Really a nice price to performance sweet spot. If you had just said gaming I would recommend the e8400, but if you want the multitasking as well q6600 is the way to go.
P5Q - I would recomend the pro on principle, but you are running an Nvidia card so no need for the crossfire.

PSU wise there is a PSU tier chart I use @ xtreme systems. They are updating it but it gives you a reasonable idea of where your brand lies.

http://www.xtremesystems.org/forum [...] p?t=108088

Coolermaster Real Power is Tier4. Not so great. Extreme power seems to be lower wattage then real power and therefore probably made with cheaper components (and worse).

A Spire Rocketeer V/VI is listed as tier 3 so I wouldn't dismiss them as a quality PSU manufacturer. Stay far away from version IV of the rocketeer as it is crap. Also reviews on versions V and VI are rather positive.