DTG North American
This is a lightweight clock that works off of 2 AA batteries. It's a FIDE approved clock and supports bonus (increment) and delay time settings.

 
DTG 2010 FIDE
This is a lightweight clock that works off of 2 AA batteries. It's a FIDE approved clock and supports bonus (increment) and delay time settings.




DGT 3000
This is DGT's flagship clock. Lightweight with large display. Works with 2 AA batteries. Clock supports bonus (increment) and delay time settings.
 
Saitek Digital Competition Pro
This clock is heavier because it takes 2 C batteries. It has a mechanical plunger system. I have seen several of these clocks that the navigation button is missing.
Chronos Clock
Available with button or touch sensors. Certainly one of the most durable and popular clocks.

Z-Smart Fun
A popular clock, like the Saitek, it takes C batteries so its a heavier clock.