I held a director level position at a nationwide chain of makerspaces for several years, and have worked with big tech companies building their own makerspaces. I'm not boasting, but I have more experience is setting up maker spaces than all but a handful of people in the country.
In some respects, the tools you select don't really matter; all you need to do is buy robust enough tools so they won't immediately fall apart, without blowing your entire budget. That part is easy. Honestly, the difference between a MakerBot and their competition isn't that much, and the same is true of most tools.
The thing that will make or kill your lab is training and maintenance. This is the most important thing you will read all day; ignore it at your own risk.
If you put a few 3D printers on a table, expect people to use them correctly, and have somebody add "printer maintenance" to their job, you will fail. In a month, you'll have broken printers, irritated users and overworked staff. You simply must have a system for training how to use the tools in the space, according to your set of rules and expectations. You need a system to keep un-authorized users off the machines. You must have people on hand to answer questions, and help your users, post-training. You must have dedicated maintenance staff. If you have a collection of perpetually broken tools, your users won't respect the space or tools, and it'll will turn into a nightmare.
There's a reason that makerspaces aren't an easy way to make money; it takes a large, competent staff to keep them from turning into a disaster area of broken tools.