CookEggs

Hi Forum peeps. been reading and researching for a while now, but thought well why not ask the community considering I need a bit of inside help. Laptop - Clevo P375SM/Sager NP9390 Graphics Card = Nvidia GTX 780M RAM - 24 gig CPU - i7-4700MQ CPU @ 2.40GHz My laptop has hit a point where the graphics card is starting to not perform with what I'm trying todo (games, work on a 34inch 2k monitor). I'm looking to upgrade, considering the laptop is fine in other aspects. Was considering buying a whole new desktop. but I thought well I can buy the powersupply and Graphics card now, make a eGpu system and later down the track eventually swap over to desktop computer. Just looking for help - What card I can get, what equipment etc and the best way to go about this. Was looking at getting the Mpcie (remove the wireless card) and do it that way?. Much appreciated.