If I was going to buy one of these things for myself (and I plan to), I'd definitely opt for 16GB RAM and the 8-core GPU. For the extra ports, the extra fan, the ethernet. It would be worth it. A terabyte of storage, too.
The things are likely going to last a while, and I'd want it to be relevant for a good long time.
And I'd definitely stick with the yellow. It's awesome.
