Problem is I tried one with that set up and it is terrible.
It's actually quite good if you know how work with Optimus profiles.
Even if you go back into the Core 2 Duo laptops all the laptops will have integrated (on the motherboard) IGPs like Intel GMA 4500xx or AMD Mobility HD 4250.
But at least you wouldn't need to mess around with Optimus or AMD Switchable Graphics.
One example: Alienware M11x C2D SU7300 & GT 335M $650