You can try Camtasia STUDIO. Is a good program. When I tryied Sony Vegas at my computer (1GB RAM) It was very laggy. And this price is a """""". But if you mean program to capture video from scrren without lags, with HD, and low memory use, you can try Hyper Cam 3 with DivX codecs

GTA 3 is available on mobile devices (android, iPad, iPod, and iPhone.) GTA Vice City will available soon (in 2013-2014)