Help to choose a Videocon mobile

I interested in Videocon mobiles. I have two doubts, please clear these:

1.) Videocon mobiles are good in:
Battery
Camera
Internet Connectivity
Dual Standby
Service/Repair

2.) Which one is best:
V1575
V1665
V1603
V1805
A15

3.) And more, Can I off the A-GPS / GPS on Videocon A15 model?