Sony Vegas video editing under 700
Hello, i'm looking to purchase a new desktop computer. I have never built my own computer. My budget is $700. I need to be able to edit 1080p gopro footage in sony vegas pro 12 as smoothly as possible. Video editing is only a hobby, however i do it fairly regularly. I know with this budget I will not be able to get much, but I am trying to find the best possible option. Editing will be fairly basic for the most part with a few multi layered areas, color correction, and Twixtor for extreme slow motion. I do not need to edit in full hd, i'm willing to turn down the resolution while editing. The main thing i need is to be able to scroll through footage and edit precisely without lag. Currently, in order to playback footage i must do a dynamic RAM preview, which takes a very long time and is very short with my 2gb of ram. I have an HD dynex television to use for a monitor. I greatly appreciate any help !