Cheers, I reckon it was definitely worth doing the upgrade to the N4s, it means I can record cleaner sounding demos without the hum noise, which used to put me off a bit.
I still have the set of three Fat 50's packed away in a plastic bag.
I also ended up swapping-out the original stock bridge of my Fender USA Strat for a new chrome SuperVee Bladerunner bridge, because the knife edges on the stock bridge had some wear on them, and the stock bridge wasn't returning to neutral like it was supposed to, and then the stock tuners wore out which forced me to install a set of vintage-style Klusons on the headstock.