As for your main question - yeah they're both fine, can't go wrong with either, the biggest difference is finishing - Alder is much easier to finish. I would recommend spending a bit extra for extra-light, or chambered - more comfy and you can get a bit more resonant sound from a lighter body. At least that's the common wisdom, I have a heavy guitar that's very resonant too.
Callaham makes the hardware that you want, at least the bridge for sure.
Locking tuners are probably worth it even on a vintage-look strat, for most people, esp. if you're a trem user. Check Stew-Mac's tuners for the locking vintage-style gotohs, they are a brilliant mix of modern function and vintage looks.
For pups, spend some time on Acme's site listening to their sound clip comparos. Lollar also has a nice collection of sound clips on his site. Forum faves for strat pickups are: Fralin / Callaham SRV 'cryo' set, Fralins in general, Dimarzio area series for noiseless. For a hotter sound, Rio Grande has fans. To save bucks, I would really, highly recommend checking out Bill Lawrence's "keystone" pickups - not BL USA! - almost impossible to find good info on them, and their service is hit and miss, but the product is outstanding and $85 shipped for a full set of USA-made and very well designed pups.