I have tried few editing software's and I have few in mind, Sony Vegas, Adobe Premiere, Adobe After Effects are the main ones, before I can recommend any one of them you need to tell my your purpose in the software, as in do you want to make high end animations using effects and different tools which are used in many youtube edits than Adobe after effects is what you are looking at, if you are looking at cleanly cutting your videos applying transitions, text, and Audio video overlays than I would go with either Sony Vegas or Adobe Premiere, (I run a 4.2 GHZ i5 and when I try to import videos into vegas it quits, maybe even because of the GPU acceleration) so for ease of use I would ultimately recommend Adobe Premiere for purpose 2