A 1060 6GB card should be plenty for basic 5-man multiboxing at 1080p with managed settings. Looking at those prices, they aren't all that far off of Amazon in the US. 250-290US there vs 220-290 here. For example, the ASUS STRIX-GTX1060-DC2O6G is about $300US here on Amazon, and if my conversion rate is right, it's about $284US there. You'll still need to manage background client settings to make it work well but that should be sufficient, especially if you've been OK with a 9600GT.