Help! rMBP 13' i7 with 4gb of RAM or i5 with 8gb of RAM?

I want to order the new 13' rMBP, but I can't afford to get all the upgrades I want so I'm trying to figure out which one would be best.

I'm trying to decide between these two options:

1) 2.4GHz i5 , 8GB of RAM, and 256GB flash storage ($1,499)
2) 2.8GHz i7, 4GB of RAM, and 128GB of flash storage ($1,599)

I would have bought the i7 and got more RAM later on but since the RAM is non-upgradeable I have to choose before purchasing. It's like Apple wants me to go broke all at once!

Which would you get, if you only had to choose between those two options?