I have a ROG ASUS G750JW bottom of the range and it runs all the games I play on ultra settings.
Paid under a grand for it and another 200 quid for a SSD.
Its well worth getting something with a SSD but its sometimes better to upgrade yourself later.
The games laptops all have dual SATA disk ports so its no problem.
apart from it being a lump of a machine 5kg I really like this laptop. All the heat gets squirted out the back and it flys along.
I have 8.1 on it and have no problems.