Couple of other things:
* Hours
* Integrity of decking (floor) bounce around all over it to make sure there are no weaks spots hidden under the carpet.
* Prop and Shaft
* Make sure to check the platform mounts as you will read in some other posts there have been problems on some boats with them cracking through the transome
*Make sure all the gauges work properly especially the depth gauge.
* check the winch, axle(s), lights, and brakes on trailer
Steering make sure it is tight with limited "Play"
* Obviously check all the speakers to make sure they work as well as the CD/Tape/Changer which ever it has.
* Check the rear holdowns and rope cleat (please tell me you will never use this)
*Lastly, Check for any indications that the previous owner used the boat to pull a tube or any other inflated toy. If they did you will probably have to take the boat to a priest to have the demons driven away before you can wakeboard or ski effectively with the boat.

Hope this helps and good luck!!