Bushnell trs25 is the defacto affordable decent red dot, buddy has one on a 10/22 in an arkangel nomad, goes well IMO. I've got a vortex crossfire on an sks that I really like, very similar to the trs25 but it claims a 2moa dot vs 3moa on the trs25.
I got the crossfire on sale, otherwise I would have gotten a trs25 as they're a bit cheaper normally and also on sale all the time.