Hi, I'm looking for a gaming laptop and need some recommendations

1) Preferred Brand- Any except HP and Dell
2) Budget inbetween 4k - 5k
3) Usage heavy gaming and to be able to play high end games (like the upcoming battlefield 4 but not as much as crysis 3 lol)
4) preffered screen 17"

I checked out MSI GT70 2OC-408US and Lenovo IdeaPad Y510p and right now I'm leaning towards the MSI machine but I would like more recommendations and suggestions to help me with my final decision.

Also if someone could help me clear out which is better from these 2
Dual (2x) NVIDIA® GeForce® GT 750M 2GB (on select models) with Ultrabay
and
NVIDIA® GeForce® GTX 770M 3G GDDR5

Thank you in advance!