Thanks everyone for all your input. Really very good food for thought!
I have been trawling our favourite online auction site to get a feel for what I can do and I managed to get a the following:
GTX 660 for £68
8GB Crucial Balistix for £41
Intel Core2 Quad Q9650 for £45
So, for £154 I should be able to get, maybe not stunning but reasonable gameplay without having to also upgrade my motherboard or PSU. It seemed like a reasonable temporary step and I imagine I'll be able to resell it all for not too much loss in 6-12 months.
The longer-term plan is to wait until we start to see VR on the market, to assess the requirements for that and also the requirements for 'Horizons'. Then I'll get the big budget out and treat myself!!! Mmmmm.......
Anyway, thanks again for all the thoughts. I'll come back in a week or so to let you know how it plays - okay I hope!
Thats not a to bad upgrade and will keep you playing for a bit longer so you can save up properly.
And you will need to save alot to have VR running at high resolution (2 to 4K per eye) and 90FPS.
2x980ti SLI isnt even enough yet, hopefully the new 16/14nm graphic cards can do in it SLI or CF