You're right. I'm not.
Now I get your idea. My skin's so thick today that you probably could have said anything and I'd still have posted. Thankfully, this thread isn't about you or me, it's about the people who read it and try to make decisions. As such:
Raphael cats are pretty hardy, but hide all day. Good for the patient beginner but not very rewarding or large. Affordable and common, though.
Common plecos are large, affordable, active and hardy. Types like albino sailfins make a great showpiece alone in a big tank.
Chinese algae eaters are aggressive as hell, get about 8", and cheap. They might be a tad bit more sensitive to water conditions, but are otherwise suitable for the beginner.
Those are the first few that come to mind.