Base model. Consider though whether the 256GB HDD is enough for your media. If it isn't, consider whether you'd be ok with moving stuff on and off an external disk as needed, because the cost of upgrading the SSD is pretty steep right now.
And yeah, how important is a 15" retina display to you right now? If it isn't, a 13" Air would probably be a nice machine for you.
Honestly for a user such as yourself, you will not need a retina macbook. I would recommend an Air or the base 13inch MacBook Pro. You won't be taking full advantage of the retina display, nor the graphics card or CPU. However if you insist... Get the base optionally you could increase the storage space from 256 to 512 or 768 depending on how much files you have currently on your current pc.