If I may suggest- Perhaps consider purchasing your 7750 based watches pre-owned; you'll not only avoid the depreciation factor in buying new, but you can also inquire on movement performance as well. Granted, I think it's always a good idea to have these movements overhauled when first received as it's good to get a baseline on service, at least you'll have an idea on how well it's running before hand, and can perhaps enjoy the watch for a while before having to send it off for work.
When you do send the watch in for service, consider any other items you'd like to address at the time, like lume, AR, etc. Wearing the watch for a short while will allow you the opportunity to get familiar with it and you can then better determine what areas you'd like to upgrade.
Good luck! Unfortunately, that's how it sometimes goes with the rep game. You do run into small issues from time to time, but the risk is not limited to reps- Gens can exhibit the same flaws and problems as well