Thanks as always Fitz
I've been looking into various forums & stuff for a comparison between slim vs gdm & I didn't get much useful info.
Most people in those forums (mainly crunchbang) claim that gdm uses like slightly more resource than slim & the performance difference is pretty much negligible + if you use slim you get the benefit of customising theme & stuff but if you decide to switch to another wm / de that process has to be manual.
So overall I don't think it's worth giving slim a try at the moment, perhaps another time.
Also I looked into the CoreCDX release of Sabayon and it seems like it has pretty much gnome-3 dependencies built into it...too much stuff that I don't need so I'm considering installing from Spin base release and install openbox into that.
Can anyone tell me what you get with Spin base release? Thanks.