Hi everyone. I just noticed that Assassin's Creed is coming out for PC so I want to do an upgrade/OC to enable to me to play it well. 
Below are the minimum requirements:
Here is my current spec:
Now, I have a budget of around £110 (low, i know, but not much cash around atm) to basically be equivalent (hopefully better) than the minimum spec. Now I'm definitely gonna get 2gb of decent RAM but what else should I buy, a new CPU or GPU, and whatever I don't upgrade, what should I OC?
Thanks.

Below are the minimum requirements:
Supported OS: Windows XP / Vista (only)
Processor: Dual core processor 2.6 GHz Intel Pentium D or AMD Athlon 64 X2 3800+ (Intel Core 2 Duo 2.2 GHz or AMD Athlon 64 X2 4400+ or better recommended)
RAM: 2 GB (3 GB recommended)
Video Card: 256 MB DirectX 10.0–compliant video card or DirectX 9.0–compliant card with Shader Model 3.0 or higher (512 MB video card recommended) (see supported list)*
Here is my current spec:
Asus M2V Motherboard
A64 3800+ AM2 Single Core @ 2.4GHz
Sapphire Radeon x1600 pro 256mb PCI-E
1GB no-name RAM
X-Power 400w PSU
Now, I have a budget of around £110 (low, i know, but not much cash around atm) to basically be equivalent (hopefully better) than the minimum spec. Now I'm definitely gonna get 2gb of decent RAM but what else should I buy, a new CPU or GPU, and whatever I don't upgrade, what should I OC?
Thanks.