I've bought a mechanical Janome sewing machine last autumn. Unfortunately, I don't remember which model I got, but Janome has LOTS of models with only minor differences between them.

I really like it: it's small, relatively light-weight, and very easy to operate (I had virtually no experience in machine sewing, and I learned how to sew on my machine pretty quickly).

I haven't yet tried to do denim, but the machine did drapery fabric just fine.