IMO, you are already using the best of the best...and it is also the cheapest.
Also IMO, any 120 color neg film manufactured by a major company will be able to provide good-looking skin, if your lighting and preparation craft good-looking skin. Yes, I even mean Superia 100 and 400, which are "drugstore" emulsions.
These things being said, I would start by experimenting with Portra 160NC, Portra 160VC, Pro 160S, and Pro 160C. The Portras are by Kodak and the Pros are by Fuji. VC and C are the more saturated versions, and NC and S are the less saturated versions. Any of these could work quite well for a portrait, depending on what you want. When first using them, try to shoot the same subject on all four types if you can...and on Reala and Superia 100 as well. It will let you make comparisons of all six 100-speed 120 color neg films. Heck...why not shoot a roll of Rollei Digibase as well (though it might be tough to make RA prints from it)?
If in doubt, go for Reala, NC, or S. It is easier to add saturation and contrast than it is to reduce them.