Oddly enough, just posted about this. I've just got back from Nepal and found the black tea from the Ilam region to be very good. The second flush is actually better than the first, and a little cheaper too. It is very similar to Darjeeling, as it's grown just over the border. The white tea wasn't worth bothering with in my opinion. I tried several varieties and nothing stood out. Green tea varied in quality considerably. The most expensive variety they sold, marketed as "Emerald Tea" wasn't that great, whereas a cheaper organic (can't confirm the status as organic) green was really very nice, a small leaf, needle like in appearance and an odd cross between Huangshan Mao Feng with hints of Gyokuro rather surprisingly. The Ilam oolong tea was probably the best flavour, with a distinctive apricot taste, much like single tree phoenix oolongs.
Nepal sell a lot of CTC tea as well as hand or machine rolled, so make sure you know you are buying the kinf you like, which for most will not be the CTC!