In my opinion, given the current scenario, the best e-commerce platform in India is Times Internet Ltd's "Get-Me-a-Shop".
I say so with personal experience - I am their current subscriber - and have found it to be the best value-for-money. I opted for their Platinum plan which includes an e-commerce website, Android & iOS apps, FaceBook page, marketing on Twitter and Instagram, linking with multiple payment gateways, consolidated dashboard to manage selling on other e-commerce platforms like Flipkart, Amazon & SnapDeal etc, SMS & e-mail marketing, basic CRM & ERP, and even logistics (which I didn't avail since I already had my own solution).
Sorry for that reading like an ad for them, but let me give you some background to contextualise my glowing testimony...
I have been struggling with online marketing since before it was a buzzword. Paucity of funds have always dogged me forcing me to hone my value-extraction skills. Nevertheless I got led astray by a lot else promising effective marketing via the Internet but failing to deliver ultimately. So I'm a seasoned cynic, now.
Without making this post into a novel, I'll conclude here but invite you to contact me or reply here for any clarification or other details you feel I left out unanswered.
Best-of-luck in your endeavours, James.