Considering present conditions in India , I think you should focus on picking up good music !
Everything else has a decent solution here at similar or better prices !
We do not get a great selection of music here. You can check the reviews of great albums suiting your taste in music, on the Web. Then go and buy it after listening to it. You can't do that here very easily.
Maybe pick up tubes, capacitors and sockets for a tube pre amp ? Only 2 tubes required ! Alps Volume control and RCA plated sockets !
If you already have a good power amp then you do not need to carry another heavy item back ! If it's tubed, you could try to get a set of new tubes for them. Check the Net to see what guys recommend.
A Chinese solid state power amp kit might be worth it. Most sound good as they are based on tried and tested designs. They don't cost much.
Unless you are having mains power supply problems , would you really like to invest in such devices ? If your system already sounds very good you probably need to invest a LOT more to improve it a little bit ! But I bet you can achieve a lot locally by careful thought with very little outlay ! Remember the Holy Grail is only a 'mirage' !
Maybe you can look at DSD capable DAC's ! That sounds interesting. Plenty of good Chinese ones around. Or TEAC or others that you can audition.
Maybe a Bluray player as a source ? But that would not be DSD capable and worth it only if you like Music video's too. It would be good if you can access the Net on your trip. You can cross check everything you are looking at.
My focus would always be on Music. Both CD and DVD based.
I always try to minimise weight while traveling. It's a pain carrying heavy things around.
You may be a seasoned traveler already. Never buy equipment the first time you see it and like it ! The next day you will find something better and at a lower price ! I always buy ( if possible) only a few days before departure ! By that time you get a bit familiar about what your options are , based on cost and performance AND your need for it ! You will need to take down notes in a book or Phone Notepad ( better!) ! You may not remember every single detail the next day and also might forget to carry the note book !
Have a great time.

Cheers.