Good goys, let a background screen recorder run 24/7.
But yeah, shadowplay is your best option if you've got an nvidia card since its H.264 encoder is hardware accelerated and you don't end up having to manually encode 50gb of raw fraps data.
Wow machinima tool 2.4.3 on a local mangos installation if you wanna capture in game scenery footage for RP or whatnot.
Cyberlink for editing.