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I have just bought the 2.6ghz version of the macbook pro with a 750GB HDD and i was wondering if it is possible to replace the HDD with an aftermarket SSD preferably 250GB to 500GB. I know it is possible to remove the superdrive and put in a second SSD but i use the superdrive quite often.

Yes, it is very easy to install an SSD. Most 2.5" SSD drives will fit and work in your MacBook Pro. You can buy and one of these SSD drives from this link: http://eshop.macsales.com/shop/SSD/2.5 Some are upgrade kits and others are external dries so make sure you are getting a SSD and not and external drive. This guide will work for your device: MacBook Pro 15" Unibody Late 2011 Hard Drive Replacement I do not think that you will need pentalobe screws so you should check the screws on the bottom of your laptop. Hope this Helps.