Which one do i choose?

I am looking at getting a Macbook Pro, but i can't decide between:

Macbook Pro 13"
2.53GHz Intel Core 2 Duo
8GB 1066MHz DDR3 SDRAM - 2x4GB
500GB Serial ATA Drive @ 5400 rpm
NVIDIA GeForce 9400M graphics

OR

Macbook Pro 15"
3.06GHz Intel Core 2 Duo
4GB 1066MHz DDR3 SDRAM - 2x2GB
500GB Serial ATA Drive @ 7200 rpm
NVIDIA GeForce 9400M + 9600M GT with 512MB

I am a big gamer, so i need a computer that will be very fast. I understand that the graphics card on the 15" is much better, but it only has half the RAM....
So, is it better to have more RAM and less clock speed (GHz) or more GHz and less RAM??

Any help would be really appreciated!
P.s. I upgraded them so they are relatively the same price so pricing is not an issue

I know a lot of people are going to say that if you are looking for gaming then a MBP is generally going to not be for you. Get a PC and make it a gaming rig. That is what a lot of people say. However, if you are going to do gaming then it is about processing power and also your graphics card. Not necessarily ram. Plus having a bigger screen is a plus, but I am guessing that you will plug in an external monitor and have an external gaming keyboard and mouse (if you are a serious gamer).

So if I were you, I would go for the 15" that you have listed.

First of all I'm going to suggest that you don't need 8 gig of ram in laptop choice #1.

But if gaming is a big part of your computing needs, and you want a Mac laptop, then you pretty much have to go with choice #2.

As far as your ghz & ram question. When your talking having at least 4 gig of ram (more ram than most people need)...then IMHO more CPU speed is more important.

- Nick

Thanks guys! really appreciate the replies! Definately helps a lot!