Thanks guys, I changed my mind cus of your opinions.
I found 2 models now instead of a 4k monitor.
IIYAMA G-MASTER RED EAGLE GB2488HSU-B2 - €280
24 inch - TN , 1 MS and 144HZ at 1920 x 1080 pixels
BENQ XL2730Z - €449
27 inch - TN , 1 MS and 144HZ at 2560 x 1440 pixels
My Current PC SETUP:
CPPU: i5 6600k
RAM: 16GB DDR4
MOBO: MSI 170Z
PSU: Corsair 750CXM
GPU: GTX 970
I really appreciate all the help
EDIT:
I found a asus monitor with the same specs as the Benq but I think I would prefer the asus one.
ASUS MG278Q - €500
27 inch - TN , 1 MS and 144HZ at 2560 x 1440 pixels