What monitor would you recommend

Solution
Since you have GTX 1070 GPU, best would be to use 1440p monitor.

When you're low on cash then the best entry level 1440p monitor would be Acer G257HU 25" 60 Hz,
pcpp: http://pcpartpicker.com/product/D7hj4D/acer-monitor-umkg7aa002

If you want to OC (overclock) the monitor Hz values then go for Crossover 2795 QHD 27" 60 Hz.
newegg: http://www.newegg.com/Product/Product.aspx?Item=9SIA90V3FW7032
This monitor by stock runs at 60 Hz but can be OC to run on 96 Hz or even 120 Hz.

But your PC would benefit the most from G-Sync monitor. Here's best 1440p + G-Sync monitor, Acer XB271HU bmiprz 27" 165Hz.
pcpp: http://pcpartpicker.com/product/ttnG3C/acer-monitor-xb271hubmiprz

Aeacus

Titan
Ambassador
Since you have GTX 1070 GPU, best would be to use 1440p monitor.

When you're low on cash then the best entry level 1440p monitor would be Acer G257HU 25" 60 Hz,
pcpp: http://pcpartpicker.com/product/D7hj4D/acer-monitor-umkg7aa002

If you want to OC (overclock) the monitor Hz values then go for Crossover 2795 QHD 27" 60 Hz.
newegg: http://www.newegg.com/Product/Product.aspx?Item=9SIA90V3FW7032
This monitor by stock runs at 60 Hz but can be OC to run on 96 Hz or even 120 Hz.

But your PC would benefit the most from G-Sync monitor. Here's best 1440p + G-Sync monitor, Acer XB271HU bmiprz 27" 165Hz.
pcpp: http://pcpartpicker.com/product/ttnG3C/acer-monitor-xb271hubmiprz
 
Solution