At present, I use these GPS devices. Click on the link for details...
1. Magellan eXplorist 200 Handheld
2. Tycho 1037 Evaluation kit with Magnetic Antenna
3. ASUS P527 GSM Mobile PDA with inbuilt GPS
4. Mio C310 PND From SatGuide
Also Uses Nokia 5230 and Nokia E71 both having Integrated GPS with MapMyIndia Maps