I second the recommendation for vinyl plank flooring if you're gonna be doing any living in the basement (as opposed to storage/maintenance), which is what we just put in our basement. Reasons:
- It's pretty cheap! The store we went to had it anywhere from 1.50-2.60$/sq ft (and the differences were pretty minor - we got the cheaper one and it's totally fine)
- It's warmer on your feet than floating wood... basically, it keeps the heat from above rather than transmitting cold from below, which is nice when you're turning your basement into living space. Major bonus in winter.
- It looks nice. The one we have looks like wood. Ok, looking closely at it, something looks off... but you have to look really closely.
- It's super easy to clean. Flood? Mud? Oil spill? No problem. Mop it up. Nothing leaks through, nothing gets damaged, nothing gets warped. Brilliant.
If you're not gonna be creating any living space in the basement, painted concrete should be fine.