Just last year it took a trio of TitanX GPUs to eek out under 30 FPS in games. The 1080 is nice but 4K gaming from what I'm reading is not possible at 30+ FPS with a single 1080 GPU and high settings in modern games.
I worry you'll dump thousands and learn this first hand.
For now, try a nice 1080p display laptop which the 1080 will drive at top speed in games.
Should i buy a Asus Rog G701vi-Xb72k or a Msi Gt73vr titan pro-225 4k UHD. Which of these two is better a 4k uhd w/ gsync supported or a 120hz gsync. Both has nvida1080 and don't worry about the storage because i will upgrade it.
Thank you for your answers