Cudo Miner's Top 5 Active GPU's on our platform:

1. GeForce GTX 1070
2. GeForce GTX 1060 6GB
3. GeForce GTX 1080 Ti
4. Radeon RX 580
5. GeForce GTX 1060 3GB

GeForce GTX 1070 has always been a consistent card for mining and not super expensive.