Hi to everyone and thanks for all the responses. I think I will probably go with the new MBP 13, but when in NY will take another look at the 15inch, i may also consider swapping out the drive for something faster and using original drive as an external HD.
One thing that does nag at me is the perceived value for money issue, I have done some investigating and when you come across sites such as this:
http://www.tomshardware.com/news/macbook-pro-macbooks-core-7,10191.html
You have to wonder if Apple is being complacent or even arrogant charging the prices they do. I find myself giving a sigh of relief that I have to say I have to use a Mac because my preferred program is Aperture, but in truth it appears on paper that we Mac users are being screwed on price/performance, and as a Mac user of 15+ years I suspect that too many new users are buying into the hype more than any tangible benefits; I get queasy when I see the queues every time Apple release some shiny new 'appliance'.
I have always evangelised Macs and made a lot of converts, but I find myself less inclined to do so these days, especially if all they want is to surf and write the odd email etc.
Anyway this is perhaps off topic but it's on my mind today.