I’ve been looking for 1440p monitor now for a while. My current options are this,priced around 300€ in Finland (didn’t notice anyone recommending this):
And that Dell U2719D I linked earlier. Unfortunately neither has freesync and both are 60hz panels. That BenQ is quite old model already, but according to this review it should probably be ok even today.
http://www.tftcentral.co.uk/reviews/benq_gw2765ht.htm
I would probably go for Pixio monitor if they were available in EU. Really hard to find IPS montior with freesync and high refresh rate that would also be affordable. 