Saddly I haven't tried Nakhla, but I have had a lot of Hookah-Hookah, Al Fakher, and Starbuzz.
Hookah-Hookah and Starbuzz all seem to give me a really big buzz at the beginning but then not much else throughout the rest of the smoke. Of course Starbuzz is stronger, but HH is cheaper so...
Al Fakher is my favorite because not only will I get a large buzz, but I normally get quite a few separate ones throughout the course of the session. Its like having multiple orgasms!