Then you need to mention you budget or plan how much you want to put in.
This is the most important thing. Also ETH isn't that profitable anymore. I would recommend buying an NVIDIA mining rig.
2000-2500$
GTX 1060 6GB x6
3000-3500$
GTX 1070 x6
4000-4500$
GTX 1080 x6
5000-5500$ GTX 1080Ti x6
All of these card configurations cost varying amount of money and are all good for mining VTC. VTC consistently has been one of the top earners for a while.