Pakistan is a bit sticky at present - avoid Quetta and NWFP.
Iran -if you can get a visa- will be a delightful change to the rest of the sub-continent.
The Iranian people are wonderfully hospitable and unlike the perceptions that exist of a "fundementalist nation".
I you cannot get a visa fly in to Turkey or one of the Stans.
Whilst in Pai or around Chiang Mai look up riders on the
"Perils he sought not, but ne'er shrank to meet;
The scene was savage, but the scene was new;
This made the ceaseless toil of travel sweet,
Beat back keen winter's blast, and welcomed summer's heat."