Shawn Dunmire - "speakers closer to my head" A.K.A headphones. i have these ones and i love them http://www.newegg.com/Product/Product.aspx?Item=9SIA1K029J8366&cm_re=koss_ur_20-_-0DF-00BM-00032-_-Product
vram is shared with the cpu, so it has 12gb of vram. some of it will be used by the cpu though (sources:http://www.notebookcheck.net/AMD-Radeon-HD-8510G.87918.0.html , http://www.techpowerup.com/gpudb/2191/radeon-hd-8510g-igp.html)
you cant overclock an i3 cpu. that's final.
also, overclocking is done in the BIOS, not in an OS, and the bios has to support overclocking, as well as the chipset(motherboard)
get one 1300$ pc unless you really need mobility
if you build your own pc it will be more powerfull than a laptop of the same specs
tell me what do you want to do with your new machine