That looks much better, if you're happy you won't use up your HDD. A GTX280 would be massive overkill on a 19", if anything you could possibly downgrade to a 4850 and still get very good performance and save £70. A 450W PSU won't handle a GTX280 anyway.

I noticed that Vista no longer says 64-bit, make sure you get it or you'll have just over 3GB of RAM (with the GTX260) with 4GB in your machine (like me heh, need to upgrade but costs monies).