Yes definitely go with a 770. Lightning or HOF are great and the overclocking will likely extend the length of usefulness dramatically, but if you're going to be playing a modded skyrim you'll need a card with 4GB of vram for sure. I made that mistake.
It might be a stretch for budget, but it will pay off big time with performance. If you use all the good tricks like AB, this voltmod, and whatever you can get for a bios you'll be able to get the performance of a stock 780 most likely. Also take into consideration that games will be ported from the new consoles and will need all the power they can get to play on good looking settings. And when the 800 series releases and the 700 series gets another cut in price you can pick up another 770 to sli with.
But seriously, it is always better to have a a little more performance than you NEED than a little less and have issues or have to use low quality settings or upgrade a year sooner than you would hope.