On the less expensive side for light a 30" deep tank, you will need 4 400 watt metal halides, you choice of colors, but I tend toward the 10,000k variety.
For running water, I would put a sink and drain in the room which you will need anyway with a tee off the back for additional garden hose like connections. RODI units will always come with one and is less stressful than puncturing a pipe for the other type of fittings.
I have several large 55 gallon food grade barrels for holding RODI and Saltwater which are plumbed together for ease of use with a pump between them. If I had room, I would put in another for Kalk. The saltwater exchange system is run off a controller with two BRS dosing pumps.
If you have the room, I would add a manifold for moving water to a multi-tank QT system. I am setting this aspect up now, I should have done it originally and it would have been easier.
I also have a manifold off of my main pump for running other items like reactors, other tanks in the system, I have a hose connector on here as well for getting tank water for testing or just changing larger amounts of water.
