Strat Tremolo's

Wizard

I was having a wonderful perve around Acme Guitar Works website.

Amazed by the variety of Strat tremolo's and even more so the price ranges.
http://www.acmeguitarworks.com/Stratocaster-American-Series-C201.aspx

The American Series is $60 ... the Deluxe locking is $240

Then you wander over to the Callaham upgrade area, where there are all ranges of options including a trem block for $60 on its own.
http://www.acmeguitarworks.com/Callaham-Stratocaster-Parts-C209.aspx

So ... what differences do all these options make?
And where is the sweet spot?

MikeM

All I'm gonna add here is that on my strat build (Which'll happen if I ever finish my tele) I'll be going Callaham ? Check their site on their improvements.