If you're purchasing in a year it's useless to choose parts now. The situation will be completely different next year.
Most of the stuff will be much cheaper in a year, and besides it won't be that old, only a year out of date - better compared to 6 years for my other build.
I added roughly all the costs up and it came to about £700 for this years prices, so would I be right to assume about £450 for in a years time?
By the way the guy who said Socket A was a dead socket, the XP-M processors are still very popular in custom HTPC's as they are excellent underclockers as well as overclockers so they are practically silent.