I would recommend getting the 2013 model. The only difference between it and the 2014 model is a 0.1 GHz processor bump, for 100$ more at BestBuy. Right now, if you have a .edu email address, you can get 150$ off the MBA. You can pick up a 2013 4GB/256GB MBA for 950$, which is a great deal.
If you are a consumer, you will not need more than 4GB of RAM for the next 3 years. I currently have 2GB of RAM on my late 2010 model, and I can play videogames, watch movies, browse the web, and write. Maybe in a year or two, 2GB of RAM will not be sufficient. Sure, get 8GB of RAM, it will allow your computer to work well, but it isn't necessary for consumer tasks, especially with the PCIE SSD for paging purposes.
If you are on a budget, you can pick up a new 2013 11" 4GB/128GB for 650$ with the BB student discount. That is a really good deal, and it will run well for at least the next 3 years.
Matt