What video cards would be good to mine, but not expensive to buy?
Need some info from you first. Is your power cheap or free?
What kind and wattage psus you got?
If power is cheap and you got the power I like 280x 7970s 290 290x 390 390x as they all pop up on the cheap
If your power is not cheap and you lack the wattage I like the 1050 ti and 1060 6gb
I recently got started with mining. I'm using nicehash and it couldn't be easier. They have a benchmark as well. Even if you weren't going to use them you can get an idea of what your system/components are capable of hashing out. I'm mining on a 1600x,1070Ti and 980 which nets me ~ 0.0009 BTc/day