as there are so many out there you will need to take a few aspects into account when making your decision. These should include number of plots per hour (very important as this will give you a sense of how quickly you can produce a batch of drawings for design reviews or customer delivery), power usage, the cost of paper/cartridges (though this tends to be quite equal across all - do you need colour prints or just b/w?), footprint (how much space will it take up and how heavy is it - will the floor take its weight), does it scan & copy and of course cost (management will want to know how much).
Once you have these bits of information then collate them into a tabel for easy reference and comparison. Try to go see one in action, some companies do offer this facility or may take you to a customer who has one.
Personally I've used HP as they have been relaible and they've had deals on for recycling old LFP's but ultimately it'll be down to you to recommend a cost effective unit that the management and users will praise you for.
Colin