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rooftop unit needed

we are looking to replace a 10 ton gas fired, dx rooftop unit that serves a critical file area.The unit that is there now is more of a comfort cooling unit, and we are looking for more of a precision cooling unit, such a Liebert. In short the unit needs to provide mechanical cooling year around, and have a de humidification cycle. The conditions that the room needs to maintain are 65 degrees, and 45% rh. Any suggestions would be much appreciated. thanks to all.
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Comments
Whoever you go with, make sure the salescritter understands the requirements. Go over the submittals & make sure it says it'll do what you need, if it doesn't call the mfgr's engineering dept & ask.
Are you looking for reliability, staging? Does the load stay the same all the time, or is changing due to environment?
Are you looking to keep the equipment on the roof, or put it down below now?
Do you need the humidifier in the equipment? Will you want dedicated controls or are you managing it with bms?
Looks like this unit can provide the dehumidification.
Either put humidifier in the space, or find a dry steam type model. Go with traditional vapor humidification and you wanna get your duct work up to snuff.
http://www.daikinapplied.com/rooftop-rebel.php
Out here in the west, we worry about keeping the humidity in critical environments high enough.