Buy the best one you can. If the pin gun is a good fit to shoot then buy it. It is a mistake to buy a project gun as your first gun. Buy one you can shoot and enjoy right now. You can find a A grade in good condition later. Do not buy a series of money pits with the intention of fixing them up. All you will have is a closet full of guns needing work instead of a smaller closet full of fine guns to enjoy. Until you have a decent number of guns to enjoy, spend your money wisely on solid shooters.
This works. BTDT