I agree, Dave - I can run FSX a cinch in most scenarios, but P3Dv2 is taxing my card to the limit, due to its 'mere' 1GB of VRAM.
I did consider this when I upgraded to the GTX560Ti, almost 3 years ago (I thought it was 2 years - isn't it amazing how time flashes by faster, the older one gets?

) but unfortunately at the time they only did the card with 1GB, so that was it.
I've been scanning the e-shops for my next upgrade bits, which I'll be buying in February, and it's shocking. I want to stick with nVidia and I'd prefer to have more than 2GB of VRAM, but they just don't seem to do 3GB cards. The cost of a decent (GTX type) card is around the £200 mark - which is fine for me, especially considering what we used to pay for top cards (note: top cards are no longer necessarily top
of the range cards!) and for much better performance, now, too.
However, the next size up is 4GB plus, and the price suddenly jumps up to the £450-550 range!! No way, Pedro!
Of course, I could grab a couple of 2GB cards for about £180 each and install them together in SLi, but I really don't want the hassles that can go along with that kind of set-up (and I'd need a new PSU as well).
So I'm hoping that in the next few months a few reasonably priced 3 or more GB cards will be around at a reasonable price. I'm never going to pay more than £250 for a card again - got stung once by that in the past and learned my lesson. I'll need such a card for DCS World, too.
It needs to be a GTX card because 1: I've found nVidia to have the better cards and software for the stuff I play/fly etc than AMD (I used to be an ATi fan before the 560Ti) and secondly I want to run 3 monitors from it with their "2D Surround" system.
I'll need to up my 6GB RAM to at least 8GB, too, and I'm planning to go all SSD except for back-up discs. So I won't have much change from £1k. P3D had better run like clockwork then!