Polish - I use, and would recommend, Menz 203S & 85RE.
Wax - of durability is your main requirement, you're better off with a nano or glass sealant (12-24 months), G-Techniq would currently be my choice for this. If you specifically want wax then FK1000P is a hybrid but very durable one (6 months).
All in one - Werkstat Prime (either Acrylic if going sealant or Carnuba for waxes on top should you so wish). Both variations of this work best when used with the full kit though, i.e. the respective Trigger & Glos, however both 'systems' are incredibly easy to use and will give 3-5months protection depending on how many layers you do.
As for being able to use in direct sunlight - anything Poorboys is great for this, but the waxes will only give 2-3 months protection and EX/EX-P up to about 4 months realistically.