Well the Q6600 would be perfekt for me as i can get it relatively cheap from ebay. Thanks for the Advice. In addition to that how would the 9600 GT be that bad anyway ? . I would like you guys to make me know , about the difference between the 2 Cards (hd4770 and the Nvidea 9600 GT) . Because when i read the characteristics of the 2 i didn t see a very big difference. Does the 9600 Being an "Oldtimer" makes it provide low Performance on gaming scales?

the 4770 is newer and around 15 to 25% faster than the 9600gt it even matches the 9800 gt and gtx in some benchmarks.

Ok thank you guys , i have made my choice :

Quad Q6600 Processor
ATI HD4770 1 GB
4gb Kingston 533 (2x2GB)
Samsung HArddrive 500 GB
MSI P965 Neo 2 Mobo
650 W Power Supply (3xPCIe 3xSATA 20/24 Pin SILENT)
And thats it , what do you think ?

if i were you i would get some 800 mhz DDR2 ram and drop the 533 ones also i hope thats a reliable brand power supply.

Would the 800 Mhz rams work on my Mobo?

yes it would it supports 533 ,667, and 800 mhz ram

Can you please explain to me what is the difference in matter of speed ( Where can it be noticed)?

well 533 ram is barley any upgrade over older ddr ram i personally run 800 mhz ram in mine and also you cant tell a difference once speeds exceed 1600 mhz ddr 2.

Thanks for your help i appreciate...

DDR2-1600 !!!! What the hell are you smoking ?
I don't think I've seen DDR2 pushed past 1200 very often. I managed to get 2 x 2Gb Crucial Ballistix from DDR2-800 to 1180 on an EVGA 680i (unlinked memory) and that took a bit more than their rated voltage to achieve.I have seen a set of Crucial DDR2-667 do close to a 100% overclock...but 1600, well that's something else entirely...

Faster RAM speed doesn't necessarily equate to anything other than small percentage differences in benchmarks- you won't see any real-world differences between DDR2-800, DDR2-1066 and DDR3-1333 for example.
Good DDR2-667 will achieve 1000+ MHz but at the cost of more relaxed timings. I would concentrate more on the the voltage required to run the modules (1.8 volts is standard and gives room to overclock/tighten timings (reduce latency), while cheaper lower performance modules run at 2.1 - 2.2 volts) and the latency - usually expressed as "CAS" or "CL" (or occasionally just "C"). For DDR2-667 a CAS/CL of 3 is good, 4 is ok. For DDR2-800/1000 then 4 is good, 5 is average/poor. Most DDR2-1066 is rated at 5 (and can run at DDR2-800 at CAS 4).
In most situations (other than benchmarking) there is very little to distinguish between DDR2-667 CAS/CL 3 and DDR2-1066 CAS/CL 5 for example. Be aware that good 667 RAM is mightily expensive while 800 CL4 is realtively cheap. Note that if you get DDR2-1066 your motherboard will have to support XMP or EPP profiles for it to work "automatically" or you will have to configure the timings manually.