Chennakeshav Shenoy is mighty impressed with the Wickedleak Wammy Titan 5.
If you do not require too many higher specs I would say that the Mach One is a better bet than Karbonn Titanium Mach Two for your money.
Wickedleak Wammy Titan 4, available for Rs 15,000, is a very good bargain. More so, if battery life is of primary concern, and I bet, nothing out there is this good. But if you want a sleek phone that is light in your hands and on your pocket please look elsewhere.
If you need a smartphone to message and call, this is the phone to buy. A lot of focus has been levied on build and quality, which goes missing on most of the other smartphones.
There are some niggling issues that would make one frown a bit but at this price I think you can compromise on those.