1. Dont buy lard lad. You can win them in the myster box for 6 donuts, rather then the 110(?) it costs in the store.
2. Springfield gorge gives you a PREMIUM skin for Bart, essentially makng him a premium character. I generally avoid skins unless it is one I really like or it turns a regular character premium.
3. You have a much better chance of monkeys flying out of your butt then the lard lads getting a % or being able to be sold.
4. Out of the characters you mentioned, I would go with Scorpio, but he has always been one of my favorites. Who doesn't love a guy with a flamethrower?!?
5. The indian casino and Marges mom arent up for sale too often, so there is that to consider?