Crollo, thats like comparing a Renault to a Mercedes.
Sure, they can bot go up to 100km/h in 4 seconds, but one has much more quality and will definetly last longer, and the other doesnt.
For 300$ you can hardly buy a HiEnd GPU not alone all components.
He doesnt need an i7, but if he can aford it, why not. On the used markets, slower models are always cheaper, always has been like that, there are good cpus for little cash. You will always find that the best costs the most. Even when the difference is a mere 200MHz, the price can be 2x bigger.
You are right if you think of it that way, the performance is similar.
Chosing the right motherboard is the most important step of the process, by my point of view.
Not only does it need to have quality support for the CPU, Memory, GPU, but also it needs to be built with quality and last. Mother boards unter 150$ wil RARELY have 2x 16xPCI-E, and or other functions, such as memory speed and ammount support
As well as in other connectivity support and features.
If he is planning on buying a high end CPU, he needs a high end MoBo. The one with quality capacitors and voltage regulation, as well as support for the newest hot shit.
As i wrote up, you need many things out of a MoBo, out of which the most important is quality voltage in the system and regulation. You want it to last, not die as soon as the warrenty runs out, lol.
RAM speed is the speed at which the data is transfered into and out of it. The faster RAM is, the better the system performance. Even 100 MHz is a whole different level of performance.
I also think he should get 4GB and upgrade latter as needed. 8GB wont give him much improvement for now.
Skals, integrated GPU does not aid/improve the real thing.
Plus, its dissabled when you insert the real deal.
And also, it uses up your system ram, so you dont want it.
I personally would not chose an ATI, due to bad experience with it. But Nvidia is more expencive for what ATI can give you, so you will need to chose.
In my experience the best Nvidia brand is Gainward.
HDD, as striker says, but why waste 100e more on an SSD when you can get a VelociRaptor from WD which has similar transfer speed and more space than an SSD for that price.
As for other parts, Blue is good. As he said, green is too slow.
As for CPU, id personally go for a non GPU one, socket 2011 is the one with out.
Its pure Intel power.