Spending £600 on a PC is a waste of money, and it will be totally worthless in a year. You should be able to get a usable one for half that price.
Even better, you could get stuff for your PC that you could use on your A1 and toss that PC motherboard out when your A1 comes. :-)
I don't blame you for disliking Linux. It really is a load of old rubbish.