If it's not frowned upon to link to another forum, this thread is very helpful: Invalid Link Removed
I swapped out the stock bridge for the Hipshot Vintage Bass Bridge with .669 string spacing, which is a terrific bridge. It has four saddles, is solidly built, has the right look, and maintains the narrower string spacing. Also, the strings anchor in the bridge with a simple "keyhole" type system, so if you have any electronics work to do, you can slack the strings enough to take them out of the bridge while not disturbing the post wraps too much. The Hipshot isn't the cheapest option, and you may have to wait for them to machine it, but it's an excellent replacement. Incidentally, my second choice would have been the Schaller Roller Bridge.
I tried the DiMarzio Fast Track 2 pickup, but it was too hot for my preamp. I have a Duncan SSL-2 Strat pickup in there right now, which works fine, but since I want to use that pup in a guitar, I have a Dragonfire Duo Rails on order for the Bronco. If I had more budget to work with, I'd go with the Duncan Cool Rails. But the Dragonfire seems to be a sleeper.
I've been lucky, in that, like Ronbeast, the tuners are working fine for me. Otherwise, I'd spring for the Hipshot Ultralights.
As for strings: The stock Fender roundwounds actually were pretty good for me, but under the "grass is greener" principle, I tried GHS Precision Flats and didnt' like them. They seemed fairly dead, even for flats. Now I've put D'Addario EXL0160S rounds on there, which are medium gauge (.50 - .105), and those are much more stout. Depending on the age of the player and personal preference, you might stay with a lighter gauge, but if you want a more firm tension, that's the way to go.
I'm also debating a refinish of the body: rough up the factory poly, Zinsser BIN primer, Duplicolor Mocha Frost, then Minwax Clear.
Hey, Hopkins -- Is that the ReRanch Fender Desert Tan '59? Looks good.
You're right about the neck; that's the key to the Bronco. In fact, a lot of budget guitar lines, including Epiphone, are nailing the necks these days, making them serious contenders. I have an Epi Les Paul Jr that is as solid as you please. With a Duncan JB, it's a rock machine.