Howdoo and welcome to OOF. Best place for Omega info on the web. Pull up a keyboard and feel free to join in the gags and banter in genchat and elsewhere....
The car you have spotted is a pre facelift that has climate control. Its not a mini facelift as it has see through headrests and no side airbags on the front seats. Engine is the short plenum rather than the longer plenum version of the later models.
Does have the Irmscher bits and bobs but also higher miles.
As others have said, probably heading towards the top of its value but, as always, dependant on actually viewing the car and getting the best impression of how its been cared for. At least one tyre seems to be a Pirelli!
Ensure the timing belt and tensioners have been done at 40k miles/4 year intervals, without fail. Rocker gaskets do leak. Front wishbones do wear. Heater Bypass Valves do fail as do oil coolers. Read the info on here and get as much bargaining info as you can...
good luck!!