For the most part, the noise level of a rackmount will drive any office batty. One trick to remember is in most cases going to thicker(from 1U to 2U to 3U etc) should get quieter if the specification aren't increasing as well. Also a 4U is basically a tower anyway.
My recommendation would be if your looking for it to run offsite and your users are remoting into it, definately go rackmount, but if your maintaining it yourself at your location and you've never worked with a rackmount before stick to the tower-style systems.
Don't mean for this to be any sort of advertisement, but more of an example. We have really only one design in a 1U size that gets anywhere near the silence of a modern day box, it's a tad louder but when in the same room it doesn't interefere with phone calls for either end. The reason it's able to be so quiet is the design of the motherboard is optimized for the airflow from a single blower, and with the motherboard controlling it's speeds it will only push the fan harder when it needs it. With most dual cores that doesn't appear to be very often.
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