What I have found to be the most common problem is the final drive cases loose causing the bolts to break off, tear out the threads, etc etc. The result is a farmer repair by overdrilling the holes for large bolts and or welding the final drive on. Some of the final drives are broken where they mount to the trans case. Take care that they are for your tractor too. The final drives on an A and a super A are not the same. the drawbar mounting is different. The super A drawbar uses a large hex bolt and the A uses a small one. The Super A drawbar comes off just by loosening the bolts, A needs bolts removed to do so. If one has been repalaced it may be fun mounting certain implments.
I won't judge you either way on the Ford....I have a bunch of those too. I like them all. As far as it goes the 2N has 3 point and hydraulics...the A has none. Todays implements fit the 2N such as a plow or harrows that you can get at Tractor Supply or any other implment dealer...The A? Well....happy hunting. What you plan to do with the tractor should be your most important factor in making a decision.
I would love to have a BN here to ted and rake hay with.