Im looking into buying a Toshiba L50-BBT2N22. It comes stock with an i3 4005u, but the option to upgrade it to a i5 4210u or an i7 4510u. The price difference is 150 for the i5 and 250 for the i7, but I'm on bit if a budget. Is anyone familiar with this model and if I can, how hard would it be to change out the processor later. Correct me if I'm wrong but I'm assuming the processor is pga since I can upgrade it prior to shipping. Also, would the heat sink even be able to cool the i5 or i7, or would Toshiba upgrade that as well to accommodate the extra heat.