For all that need to know. ENBs are designed for rigs that have pretty powerful graphic cards. In this game, your graphic card is probably more important than your CPU. Also, If you trying to deciding either Nividia (move expensive) vs. AMD (cheaper), Bethesda game generally work better with Nividia cards.
ENB put a major strain on your cards and it can make a game (like skyrim) that has been out for a long time not preform well if your card is a few years old. Right now, for Nividia the card to have is the GTX 770 or 780. It is roughly $500, depending on where you buy it. However, it should last you through (in theory) the next Bethesda game (crossing fingers: Fallout 4). Notice that Gopher did not go into the relm of ENBs till AFTER he updraded his card to the ASUS 780gtx DirectCU II (currently $519 on Newegg)
* Be aware if you have an older or crapper card, than ENBs is destroy your FPS, stick with Climates of Tamerial and maybe try a Post Process Injector to get the desired look.
I hope this has helped anyone thinking about going into ENBs. Currently I run an AND Radeon HD Sapphire 7870, I can barely run ENBs at a decent FPS. Looking to upgrade to a Nividia.