Suggestions for my build

I'm upgrading my P4 HT PC to a newer model for gaming; but since i'm kinda backward in the technical department i'd like some opinions and advice from the more wise ones here on the board

I'm basically getting four things: a motherboard, Processor, ram and graphics card. I've listed below what I hope to get:

Motherboard: http://www.intel.com/products/desk [...] erview.htm

Processor: http://processorfinder.intel.com/d [...] spec=slacr

RAM: http://www.newegg.com/Product/Prod [...] 6820220174

Gfx card: http://www.newegg.com/Product/Prod [...] 6814102759
or
http://www.newegg.com/Product/Prod [...] b8800%2bgt

I've more or less decided on the parts and I'm only having two issues now:

1)The motherboard i've listed is an intel one (Which was recommended to me by the PC store guy) but from what I hear you can't overclock intel boards; so i'm hoping to get a motherboard which can be over clocked (provided i'm right about the intel over clocking thing).

I have absolutely no idea what motherboard to get nor am I aware of which brands to go for in the strict sense. I know Gigabyte is good for over clocking but it is not available where I live (sucks living in a developing country at times ). I have an option among Asus, MSI and Intel boards. There are more but these I believe are the more reliable ones. I plan to use my rig for above average gaming, college work, Internet and quite possibly video editing (the last is a remote possibility but thought i'd mention it).

Moreover, I plan to use only one graphics card so I won't need to bother getting a motherboard which supports SLI or Crossfire which will only cost me more as well.

2) The second issue I have is that i'm not sure which graphics card to get: the 8800 GT or the HD 4850. I know the benchmarks prove that the latter is quite superior to the former in terms of performance but the heat factor for the radeon card is a serious dis-incentive for me to not get it; not to mention the fact that I can only get the HD 4850 from HIS and Force 3d manufacturers, both of which are honk kong based (I've had bad experience from the Nvidia cards i got from Honk Kong based firms) and hence my reluctance to buy from em. The Nvidia card on the other hand has XFX and BFG manufacturers available so i'm leaning more towards this card.

Moreover, since i've never bought ATI cards before i'd appreciate it if you could recommend some decent mfgs for this card.

I currently have a PSU of 600 watts:
PSU: http://www.coolermaster.com/produc [...] e=22&id=51

So I doubt the power will be an issue. Feel free to criticize and give suggestions on the other stuff as well as you see fit. If anything else comes up, I'll just post it then.

Thanks in advance