Be sure to get a decent grinder. At 2.5 Kg a week, Id go for a small commercial grinder as well.
As for the machine, Im sure youll soon get plenty of advice. Any semi-commercial machine will work well. Im not sure of your budget, but things to consider are: direct plumbed unit or tank model, semi-auto or auto, semi-commercial or fully commercial.
The plumbed option means that youll never have to fill a water tank or empty a drip tray. This is only an option if you have a place where plumbing it in is an option, such as a kitchen with a dishwasher.
Semi-auto vs auto isnt too dramatic a decision. With an auto you can program the buttons to dispense a certain volume. So you can make your espresso and steam you milk at the same time. Also you can program one button to flush the group and another to brew the shot. Auto may be easier in a busy office, but theres more to break down. Semi-auto means you have to both turn on and turn off the shot. Not too hard, but an auto can make life that little bit easier, giving you a simple routine: push that button to flush, lock in the filter basket packed with coffee and push the other one to get your shot. Steam milk while you wait.
Semi-commercial vs fully commercial pertains to quality of the parts. A full commercial machine will usually have a larger boiler and be a bit more robust and larger. Thay are also in the 3k plus price range. The semi-commercials are in the 2k price range and are generally smaller and cant be plumbed in.
All that said, the Domobar Super Electric looks like a very nice machine. Id also make sure that the vendor includes good support for the machine. That cant be stressed too highly, especially for an office machine.
My personal choice would be a La Cimbali Junior with matching grinder. That will set you back over 4k though. This is a commercial machine with a build quality that is amongst the best in the industry. There are pleny of other machines that can fit your bill though. The best bet would be to find a trustworthy vendor first. The machine itself isnt going to matter as much as having someone reliable to turn to when things go wrong.