Drop down from the 2700K to the 2500K, if you won't miss hyperthreading (only heavily multithreaded applications will use it such as encoding etc).
The equivalents in Ivy Bridge are 3570K and 3770K. My guess is that you'll see maybe 25 quid of a difference, since Intel isn't going to change the list prices. However you may see a knock on that the 2500K and 2700K drop down in price... also at launch if there's a shortage of chips then demand will force price to rise.
The RAM you listed runs at CAS 8 while the cheaper RAM runs at CAS 9. A benchmark might show a less than 1% difference between then, in real use you'd never notice it.