Re: First strat build...Callahan tremolo?
I did one strat build and one only. I decided to go fairly high end, so I went with a translucent color and a true nitro finish. I also went top end with the hardware and did the whole Callaham hardware kit. Bridge, tuners, string tree's.....every bit of hardware, including pickguard and pickguard shield. I think for everything it was under $300, but that was back in 05'. However, not once have I ever regretted buying the Callaham hardware or spending the money. It has worked flawlessly for the past 14 years and it will long outlast me.
My body was drilled for the vintage trem, just as yours is. I decided to go 100% Callaham not only for the quality, but to make sure everything worked together. Ironically, I bought the last full set of gold hardware they had. I can't even get replacement screws from them now, not that I've needed any. A couple months later I bought what he had left in stock in gold, just a couple small bags of screws.
I'd recommend it, because I enjoyed the experience, the quality was beyond reproach and even if I did overpay by $100 or so compared to other hardware, so what? 14 years later with no issues says something. It all still works as it did day one. The peace of mind knowing everything was made to work with everything else was nice, for me. I realize most stuff will work together, but I didn't want to bother sourcing everything separately. One order and I knew everything was there.
Good luck and let us know what you end up doing.