For me, i'll used a lot of launcher before, well i keep the installer in my sd card, and install it when i get bored with the current launcher. But if u really want the light n smooth launcher that feel like GO launcher u can try 360 launcher. I had try SPB Shell 3D, Launcher Pro, Go launcher, SE Launcher, TSF Shell 3D launcher, and many more. Some of them will getting heavy when u put a lot of widget. For right now im using SE launcher. For the best launcher, this is my rating.
1) 360 Launcher (very light n smooth + u can resize all the widget)
2) GO launcher EX (Has a lot of choice of theme and add on to choose, but it gonna be heavy)
3) Launcher Pro (stable for daily used)