Having owned both a party and fishing model,I would buy the fishing model.
Get enough motor to pull a skier.
You might also consider a trolling motor.
Also get an anchor that will hold.
X2, look around at the used market from now to about March you may find the deal of day, if you don't find one by then you will have a good idea on the one you will like.
If you are looking for new go to a boat show this winter.