I dunno about the Avanti, but your lookin at $1350-$1500 all-in-all for a new Targa LX.
I would seriously suggest a warranty or service plan with that as well, cause the Targa is a right pain in the ass to work on, you have to drop the engine to get the carb out, even.
On the plus side, it's a very solid moped when it's all tuned and running correctly.
So is the Avanti, if you can get around the wheel lockup issue, and there's where a warranty and service plan might be helpful as well.
Try test riding them both, if you can, and see which one you like best.
-R