That's quite a few questions, so I'll try to answer them one by one;
If your budget is about £300, I would spend that on a new graphics card first of all. The q9460 should still be able to handle dx11 graphics even with most of the effects turned on (wave ripples, light shafts etc), so I would definitely invest in a new card. The sapphire 5870 is going for just over £300 on this site, so if you're prepared to blow your budget on a new card, then that's the one to go for.
Secondly, I'm afraid your RAM will not work with a p55 board, as the board specifications only allow RAM to run up to 1.65V due to the P55s have a memory controller built into the CPU. The good news being that RAM is a fairly unnoticeable upgrade to a desktop anyway, (unless its a major upgrade) so you only need an extra hundred bucks or so for a decent dual channel kit.
Thirdly, SSD technology is still extremely expensive for the average consumer (think; £350 for a 160GB X-25M), and the Samsung f3 is a speedy runner anyway.
Fourthly(?), 32nm i7s are not due until 3/4th quarter of this year (with the exception being the six-cored 980x), and by the time you've waited until then, you might as well look into their Sandy Bridge series ( which is apparently targeted at a more mainstream audience ). Until then, I'm afraid the cost of purchasing an i7 is still ridiculously high, as you'll often need a new motherboard/RAM/heatsink to go with it.
And last, I'm not 100% sure. Did you hotlink (copy and paste) the link in the text box?
Hope I helped.
