This is the ENB I personally use, I wouldn't even call this an ENB, as the name suggests, its a massive shader project designed through and ENB, The main reason I like this ENB is because its not massively straining on my system, I run a Radeon R7 260X with Fallout new vegas maxed out, and my fps always stays in the range of 50 - 100 depending on my locational (I also use over 100 mods). There are some amazing ENB's for Fallout New Vegas, here are a list of some: