RON Networks are also a good options for getting good traffic if you are having good experience in running campaigns and know how to filter bad Ip's .
Also use Volumm for getting in-depth details of the campaigns which you are running. You can also take help from
Adplexity , Adbeat , Whichadswork online tools which will help you in understanding what sort of campaigns your competitors are running , their networks , budget , landing pages etc . So that you can optimize your campaign and get best ROI.