I have a Yamaha P105B. I have no big complaints about it. It doesn't "feel" as satisfying as my teacher's acoustic of course, but if it were so bad, it would be a problem, which it isn't. I've been playing for years and am good enough to play what's in my head for what it's worth.
I don't think they make them anymore, but the equivalent model is a P115. These guys are really light on features, but if you're basically trying to get the effect of a piano on a budget, they're good. I believe they run at $599.
Is the weighted keys feature good? I here there are three different options for the level of weight. Which option makes keys feel the most like a real acoustic piano?
Weighted keys are essential if you're learning for actual piano. Can't say I know the difference between the kinds of weights though.