There are many options out there.
First I begin from the cheapest ones.
For 450~500 bucks: Tech com, Intex lasers
1600 DPI. Normal 3 buttons.
*techcomindia.com/index.asp
For 800~1000
Genius laser mice:
www.geniusnet.com
Iball laser mice :
www.iball.co.in
For 1000 to 2000
Microsoft entry level laser mice
For 2000 to 3000
Logitech: MX 518 [2.5k]
1600 dpi laser
www.logitech.com
Microsoft Laser 6000
2000 dpi laser[ 2.6k]
For 3000-5000
Logitech G5 2000 Dpi [3.4k]
adjustable weights
Razer Diamondback or Copperhead[ 3.5k to 4k]
Best known laser in the world. Approved by FATAL1TY
Logitech G7 [5k]
Its the G5 wireless edition, but dun have weight adjustments, instead it has the Li-ion battery.