Sony Vaio VPC-CW2S1E/P is the newer system. I would think the performance differences are marginal at best. The LED backlit screen and the more up to date spec of this one would clinch it for me.
The only drawback is the extreme pinkness ;-))
The other system has a larger hard drive - still, they're both pretty big.
Don't forget to budget for an external hard drive for backups (if you don't already have one.)