Thanks guys, you are correct, any mac, even past macs would be enough for what i require, however i am looking to build up a machine which i wont need to change for a while (i know ivybridge might change my mind later)
But going for the base model which i have decided to do will give me some money to play with, i have been advised that getting an SSD will improve my performance significantly in comparison to doubling the amount of RAM, would you agree ?
Yep... absolutely, the SSD will make a more noticeable difference than doubling the RAM. Keep in mind though, you'll be perfectly happy with the machine out of the box. I'd recommend waiting until you feel the laptop is getting a bit slow and then buy an SSD, RAM, etc. By that time, SSD prices will have gone down with higher capacity and better read/write speeds.
If you do choose to buy and install an SSD now, do some research... not all SSDs/chipsets are made equal and there are significant differences in quality, speed, etc. Don't just compare the price/GB. I'd recommend going on newegg and having a look at the reviews, once you find a drive you think is suitable, google reviews from reputable tech sites for that drive.