I do not have much idea regarding Klipsch S2. I only have the X10.
Brainwavz official distributer and reseller in India is Pristine Note, Shop audio, headphones, amplifier, DAC, hifi, mp3, audiophile products online store India
They sold it for 2800 bucks. But the new stock is all 3600 bucks.
Alternatively if you do not mind buying it from online abroad and from the original producers of the Brainwavz earphones then go here > MP4 Nation Audio & Video Store
If you have further doubts then ask here > *www.thinkdigit.com/forum/audio/148081-headphones-earphones-news-discussion-thread.html
Someone else ordered through mp4nation recently. Maybe you can learn from them and also save some money.
If you are buying a Brainwavz M1 / M2 or M3 then get it either from pristinenote or mp4nation only.
Alternatives I am not so sure.
Don't go for Sennheiser CX300
Not much idea regarding Klispsch S3. Sorry