Side A. Say 1.5 - 2GB can/will be useful within the card's life span, with examples of games that can already utilise over 1GB.
I'm not sure thats true. I've seen claims of games that already use it but these are never backed up in benchmarks - people have yet to post a single chart that demonstrates it, meaning all we are left with is subjective user opinion which in this particular forum is dangerous because each graphics card appears to come with a contract stating you must support it, until the death, over the internet.
Side B. Say "that's rubbish" and there is no further argument or example.
I don't knw if its rubbish, which is why I'm trying and failing to clarify things. What I do know is that on the several occasions I've gone for the bigger memory card the card itself was obselete long before the memory was acknowledged to be insufficient.
If you buy a 1.5-2GB card and you're wrong, you've lost nothing.
If you buy a 1GB card and you're wrong, you are at a loss.
If you buy a 1.5Gb 480 and you are wrong, you have a very hot, noisy and power hungry card delivering the same performance as a far more efficient, cooler and quieter card in the shape of the 560 Ti SOC.
At least thats where my head is right now.
The other thing in the 560's favour is that in a years time you can pick up another one for not much money and double your performance (And get you 2gb of VRAM) by using SLI.
Unless your PC is powered by Sizewell B, this is probably not an option for the 480.