A wax is what you want for a wet look. For darker colors at a decent price Chemical guys Pete's 53 looks great. I have Sonax Polymer net shield on my car now it deepens and darkens the color. It also is just has hydrophobic as a nuba and last upto around 6 months.
For wheels your best off with a sealant like 07tggt said. Cquartz and opti coat are coatings not per say sealants. Sealant s other then jet seal are Menzerna Power Lock, Four Star Ultimate paint protection, auto finesse power seal, Sonax polymer net shield plus more. For wheels I personally like Carpro Hydro 2. It only lasts at full potential for 3 months but the ease of use especially on wheels is worth it. Clean your wheels, spray it on while wet, rinse off immediately, and your done.