Sorry I didn't see this sooner; I've been working crazy hours all calendar year and have only been cherry picking the forum until this week.
Garritan World is on sale for $69 at the moment, or as part of a $300 full bundle. I lost the details on where/when those prices apply, as I have no interest in Garritan's libraries due to poor playing and mis-tunings and other annoyances that are too hard to work around. But in a pinch, they might serve a purpose on a budget.
Luckily, I keep a fully detailed annotation of all of my sound sources. The only products I haven't had time to fully annotate yet are Omnisphere and maybe one or two other catch-all libraries. But I did update my annotation list for Ethno 2.
I am pretty sure only Dholak (Indian double-headed drum) and Tablas are included with Ethno 2. Dholak is a very useful and important instrument that is mysteriously overlooked.
For Tabla though, also look at the cheap tempo-synced articulations, single hits, and loops provided by Soundiron (this is now the one I use the most).
For Bansuri, Bela D Media's wind-controller-friendly Spiritual Wind remains my favourite as it is so expressive. The freebie in Kontakt isn't bad though. Quantum Leap Silk is OK but pricey.
I cannot find any sound sources in my huge collection for the others that you mentioned, even with alternate spellings. Those less-common Indian stringed instruments found in the Punjab, Assam, etc., most likely turn up in the specialty product called SwarPlug3, which was just updated to 64 bits recently.
http://www.swarsystems.com/
http://www.swarsystems.com/Instruments/
In fact, at least some of what you want is listed in Volume 4:
http://www.swarsystems.com/Instruments/Vol4.php
SwarPlug has always gotten excellent reviews for sampling and audio quality as well as depth and breadth, but my understanding is that it is the Hauptwerk (ultimate organ modeling framework) of Indian Music, meant more as a teaching aid in schools and private learning.
Nevertheless you can click on each instrument name to hear an audio example, and evaluate from there. The few that I listened to seemed adequate but on the level of late 90's and early 00's products. In a mix, they would probably do well. Maybe not if prominently soloed. I don't know enough about the playability of the SwarPlug engine to judge though.