Go with the lenovo ideapad y500
http://tweakers.net/pricewatch/321798/lenovo-ideapad-y500-(mbg2amh).html
With this laptop you can put in a extra gt 650m( in the ultra bay ) so you got sli gt 650 m.
http://www.lenovoshop.com/nl/prod/Lenovo+IdeaPad+Y500+SLI+Graphic+Bay/455011968
Gr neus