Check out PoorBoy's Natty's Blue, Pinnacle Souveran, P21S, S100 and consider some of the Zymol range ad well as FK1's Pink Wax. I have used all of them but I have limited experience with the Souveran and have only tried Zymol's Japon. Overall, if all factors were to be considered including price, I would choose Natty's Blue. I found it darkens and warms very, very well.
If price were not a factor, I would choose Pinnacle Souveran. It's very beautiful on dark cars. Nice and deep, very wet with great depth.
Again, not considering price, check out a recent Zymol thread. Several rave about some Zymol products but some of the prices are in the stratosphere.
I also must mention Collinite's 845 and 476s. 845 leaves a beautiful look and 476s is close behind but the durability of those two waxes, especially 476s is just amazing.
I also must mention Meguiar's #16 which has been discontinued but is still to be found if you look carefully. Several on this forum rave about it but I have not had the privilege of trying it.
This is entirely subjective of course and aside from trying everything, I guess you gotta base your choice on people's responses.
Lastly, realize that your prep is the most important factor and if that is not up to par, you will likely be disappointed in the look of your chosen LSP no matter what it is.
Have fun!
Eric