If one of the main uses will be photoshop get the premium version with a matt screen which displays the full RGB range of colours. Don't use photoshop myself but it's what all the photoshoppers recommend.
As kg648 says it might be cheaper to get 4GB and upgrade yourself to 8GB, it's easy to do yourself.
A comman complaint is the fan noise which constantly changes speed and in between gets whiney. Over a year after release no one has been able to find a solution. If you're thinking of using the laptop to watch movies then headphones are a must to drown out the fan noise.
The keyboard is nice but not as good as the now discontinued 18.4" AW series which had a better layout.
The full HD res can also make text difficult to read at times. I've always had laptops with high screen resolutions but after using the AW for a year before the F, which I've been using for another year, the extra 2" makes a lot of difference. e.g. photoshop tools should be easier to use on the larger screen.
If you don't mind used you can pick up the AWs for cheap with the RGB screen and BD-R. It won't be as portable as the F but it's not that much bigger. The F also has 2 drive bays plus the optical.
I've had to remove the optical drive in mine to add a 2nd HDD + SSD.