HTMLMaster, great shop but dosen't deliever to the United Kingdom!
If you want to all them things very well then you're going to have to spend more then £450.
I've had a look at all your things on your .doc and if you want to do all them things on it then you really will struglle. 80GB is going to make it difficult for you to have all them programs as well as other things... Theirs my two cents