I use the Le Angelique ceramic flat iron and love it. It has full ceramic plates rather than ceramic plated plates, so you don't have to worry about the ceramic pealing off and the heat will distribute more evenly. I had a ceramic coated straightener and it seemed to pull my hair more than the full ceramic plate, maybe it was a quality in the ceramic as well.
The edges are rounded so you can easily add flips, waves, or even barrel curls (and our textured hair will hold the curl better than straight hair). The heat setting ranges from like 200 to 450 degrees so it's easy to adjust to your hair type. It also heats up in under a minute. It's expensive, but I absolutely love it. It also has a lifetime guarantee so if something happens or you need a new one later you can replace it.
I know straighteners in general have improved a lot in the last few years. I've been using the Le Angelique for like 4 years though so I don't know how good cheaper ones are.