CAUTION !!!
i) I believe 1,000 Watts is the minimum for the Omega head you (and I) have. A timer with a rating of only 1,000 Watts may be pushing the capabilities of the unit to its boundaries. I would recommend against this.
ii) The Lektra TM-8 timer has a rating of 1,500 Watts.
iii) The Kearsarge timers are great timers. I own a 201 and used to own a 301. I would not pay the extra $$ for the 301 or a more-expensive model.
iv) You may want to consider buying a contactor from Kearsarge for under $200. It will handle the load from your Omega head regardless of what timer you are using. In so doing, you open your horizon to any timer of any rating, as the contactor is the devicde that handles the load.
v) The Kearsarge 201 and 301 have provision for a foot switch to turn the enlarger on/off. The Lektra TM-8 timer (as well as other Lektra timers) have provision for two(2) footswitches: one for timing exposure and one for focusing. I find this feature to be extremely useful.
If I can be of additional help, let me know. If your final choice is a Kearsarge, I can provide you with contact info for twhat I believe to be the only Kearsarge distributor - a really good guy to deal with. Finally, if your choice is a Kearsarge, I recommend you buy new - these units are laboratory-type units and don't take well to a lot of 'beating'. I have seen used units that look great on the outside but do not function properly. Au contraire, the Lektra units are built like tanks and will continue to work in spite of the most hostile environment/treatment they have been put though.