I think with all new parts, around $1350.

Used ones with suregrip seem to go for $500+ easily.

Changing gears is the cost of gears (250 to be safe) + install kit (figure $40 min) + about $250 to set them up and assemble/rebuild, + bearing $ if needed. If you know someone with a press who is knowledgeable, you can save the $$ on the labor and you'd just be out the $$ for gears and bearings and install kit.