I have been using Phoenix Secure GPS Tracker for a while now & I am pretty satisfied. My earlier tracker was from autocop but I removed it because of poor quality. You can go to www(DOT)phoenixsecure(DOT)in or call them up for a good deal and Excellent service.
There are many popular brands of GPS tracker available in the market. But I was impressed with Rebe's reply, I think that Phoenixsecure would be better fit for our requirements.