What class are you? Obviously you're not a warrior or a rogue since you can solo PoV, but your class will probably help folks recommend where a good place for you to go is.
You may have missed it, but a while back experience in PoP was nerfed, while at the same time group XP was increased. It was a direct snub at soloers, so unless you really want to (or need to) solo, group xp will likely be faster in PoP.
Speaking of group XP, LDoN is a very popular way to get XP nowadays. XP isn't as good as upper tier PoP for 65's, but it is a good second, and you can gain adventure points for very nice purchases.
Newer zones such as Veksar, Plane of Mischief (revamped), and Droga (revamped) offer good XP, can be soloed depending on the class, and also offer new loot drops.
As for PoH, it's both a single group xp zone, and a raid force zone, depending on targets. It's very nice in my opinion. I did PoH for xp and epic drops with a 50's group with no real problems. I'm unsure if it can be soloed efficiently at 65, but I don't see why not.