Dont know what lenavo to get for gaming and recording.

If you want to record gameplay, then you need a quad core CPU because both the game and the recorder will both be fighting for the CPU. Video encoding is CPU intensive.

Except for the fact that:

1. That's UK prices and the OP seems to be in the US.
2. 15.6" vs 14" screens. Some people don't like 1920x1080 on 14" screens.
3. The Lenovo has two GT 750m SLI'ed together compared to a single GT 750m or GT 765m in the Alienware.