Please suggest a Navigation Device

Hi
I am planning to buy a navigation device for my car.
Devices in consideration are MapmyIndia - Vx140s/ MapmyIndia - Vx140s Premium ,Garmin - 50LM, Garmin - 40LM.
Budget is max Rs.11000/-

Usage:
Majorly will be used for commuting in and around Bangalore
Occasional trips to Kerala

Please suggest me a device urgently.