SSD: Intel X25-V 40GB £88 http://www.ebuyer.com/product/190701
For a boot/OS drive, maybe one or two games. You can drop this if you don't mind waiting for your OS to load up, or want to wait for the technology to mature.
£1671 (most expensive items with aftermarket heatsink). Which probably doesn't leave you the ideal amount to get a really nice monitor, so you could take the 5970, a single 5870 or maybe a 480 if you not mind the heat, noise and power consumption of one (or two for which you'd need an 850W PSU) of those.
I do not know monitors well enough to give a definitive recommendation, but I think you should look at 22-24", 1680x1050 - 1920x1200 res. Try to find one with high contrast ratio (dynamic contrast is not the most reliable spec or sometimes even give good performance), low response time 2-5ms.
You could save some money by changing the CPU, mobo and RAM to the following.
Which would save £106, which would be plenty to get all the other peripherals you need. The i5-750 would perform very similiarly to an i7-930 in gaming so might as well go for the i5. And 4GB is plenty for most gaming.
that pretty much sums it up although I think raiding caviar blacks will give you very good performance and large capacities. Whereas the ssd is only marginally faster and very small. You could also raid f3's but they have slower response times.