If you can afford it, go with the expensive option or get the middle one. The 13" rMBP is good, but doesn't have discreet graphics and I think the resolution will be too small for your needs.
I have the 15" rMBP (early 2013) with 2,4Ghz, 16GB and 512GB SSD and I am really happy with it.
I don't think the speed difference between the 2.4Ghz and the 2.7 Ghz model is worth the extra money.
I would go for the 2.4Ghz model and get the max RAM (16GB) and biggest SSD I can afford, but as I already said, if you have the money, max everything up!
I have the 15" rMBP (early 2013) with 2,4Ghz, 16GB and 512GB SSD and I am really happy with it.
I don't think the speed difference between the 2.4Ghz and the 2.7 Ghz model is worth the extra money.
I would go for the 2.4Ghz model and get the max RAM (16GB) and biggest SSD I can afford, but as I already said, if you have the money, max everything up!