Thanks a lot for all the advice guys really appreciate it
I cancelled the order for the classic MBP this morning and I have ordered the rMBP
When I looked at the cost and hassle of upgrading to an SSD at a later date it cost around the same as the upgrade to a rMBP and I also got the added benefits of the retina screen, lighter laptop and new design. I decided to upgrade the ram to 16GB as well.
Thanks again for your help guys I'll let you know how I get on when I get my new shiny rMBP delivered
Good call
.