Can you roll? I'm not sure I'd go with a pure playboat, especially the Rockstar which is especially tippy without a roll. You'd likely get sick of swimming all the time and quit.
If you have a roll, then it may be enjoyable, but I'd probably stick with an All Star instead, as it is a pure playboat, without the added tippiness of the raise seat position. You may also consider a 4Fun or Fun that is a little bit in the middle, yet still surfs pretty well.
You don't want to find yourself swimming a lot early on, or you may give up.