Most tuning issues are due to badly cut nuts and dodgy bridges. If these are spot on, then locking tuners can only make it even more stable and make string changing breeze. However, if your nut and bridge are not right, locking tuners will just seem like a waste of money. I’m a big fan of Bigsby trems and fitted a Gretsch I once had with locking tuners and a roller bridge, yes they helped, but they didn’t cure the inherent ’wayward’ nature of the Bigsby, I just learnt to work with it. Now a Fender Strat trem is a much more stable beast and you can get them to behave much better, but I would recommend doing things in a logical order, locking tuners being down the list a ways.
Right then, that’s the sensible talk out of the way. You want to buy a nice, new, high spec guitar? You are amongst friends, do what makes you happy, we love a bit Gear Acquisition Syndrome, especially when it’s accompanied by photos. 😉