Thanks for all the help and replys guys
I've always shopped at Novatech for my PC stuff and am happy to go back.
As Hightower says, we have one quite local and they keep a lot in stock.
As an aside they also proved the cheapest a year or so ago when we wanted a 42" LG telly.
Rather than build one myself like I did last time I'll probably go with one of their standard systems and order it with a few upgrades.
I used to use Macs all the time at work and I do like them.
The new PC is however for the whole family, including homework duty for the smaller Nashers and Mrs Nasher who is a teacher. I think swapping betwen the two wouldn't do them any favours whilst they are learning.
Middle Nasher I'm told will also need a Laptop in September for school