Last year I bought my 64gb Mini Wifi, I wished almost immediately that I had gone for the LTE version instead, I don't really use it outside of the house because of that limitation and when I am going to be somewhere with Wifi I just bring my rMBP. I thought about replacing it but considering that I paid $800 for it and now its worth about $300 I don't think that is really an option,
My opinion, get the LTE version and even if you don't think you will ever use it without wifi, its always good to have the option