Man, is that site hard to navigate and even hard to find good parts. Any chance what so ever of any other place to shop. They don't offer 64 bit Vista for HP. So unless they offer free Windows 7 upgrade, I'd wait till Oct to build a system.
If you already have a case, do you already have an optical drive?
Not knowing what your vid resolution makes picking a GPU impossible. But I started with a 4670 for basic GPU and the price goes quickly up from there.
I couldn't get a quad in there. And for what you're doing, not sure if you need it. A quad and that mobo eats half your budget alone. And with the Ram, PSU, HDD, OS, and optical running over $500, there is no room for a GPU.
From what I gathered from that site, here's a few recommendations:
Ram - There was only 1 4gig DDR2 kit for $92. Seems fair enough.
PSU - I like the Silverstone 500w for $95. Good name and enough power to run a 4850.
HDD - The WD 320 AAKS drive was a good price for whats offered at $102.
Optical - $47 for a Sata DVD burner sound right?
OS - Vista Home Premium 32bit for $187 (see comment above.)
If you need this now, that leaves $500 for the GPU, CPU, and mobo. The 4670 is $200, and the E5300 is $124. $140 for a G31 mobo and you're out of budget. There's $35 left, but the first P5Q line mobo is $60 more, no options in the middle. Same with the CPU, you could spend $145 on the E6300 and stay under budget, but nothing in the middle.
Another options is the 4670 $200, AMD 250 CPU $142 with the only 780g mobo offered at $175. All the rest stay the same, but puts you over by $43.
If you really don't care much about the settings and just want to be able to play, then the 9800GT for $194 is a good too. You'll be stuck at lower settings gaming on a 1920x1080 if that's where you end up for a monitor, but will still be great on the 17". https://www.instantpcshop.com.au/pcshop/445/index.php?p...
Total with the GTX 260: $1099 with P43, or $1125 with P45
Total with the GTS 250: $1046 with P43 or $1072 with P45
Total with the 9800GT: $1019 with P43 or $1045 with P45
$30 can come off all the prices if you don't need the lightscribe optical.
If you are still under budget, the Q9400 is only $29 more. Main difference is it has more cache, not that big of a deal for your uses, but it is close enough in price to ask the question.
I would suggest an AMD phenom II x2 or x3, but even the 720 is super expensive relative to the prices over here. How many drives are you going to be running? I doubt you need a quad if you arent going to be doing heavy video or photo editing.
I would suggest getting a resonabley spec'd dual core processer and overclock it if you like. Not a huge number of games or software use more than one core. I agree with above - if you aren't doing any kind of rendering then quad core is pointless.