Retina MacBook Pro 13' decision

Now I'm in the market for a new laptop next month and I've pretty much settled on the 13' rMBP, but I have a problem, which one should I get ?

I can get the model with 128GB SSD and 4GB RAM for 8999DKK (I live in Denmark) or the model with 256GB SSD and 8GB for 11099DKK. That's a BIG price difference !

So my question is, having just some basic stuff such as Office and Spotify on it, is 128GB really enough storage ? All my files, music, photos etc I don't keeping on an external drive or in the cloud, but I'm more worried about program size and storage decreasing overtime. So the question is what do you guys think ?

Help would be appreciated a lot !