I don't have direct AcoustiRack experience, but I have used the APC variant and own the GizMac XRackPro2, another noise-reducing cabinet option. The XRackPro is able to run G6/G7/Gen8 HP servers in my living room without noticeable noise.
The Dell R510/R620 and UPS units won't be major contributors to noise. I don't think cooling would be a problem at reasonable ambient temperature either. I haven't seen what the VRTX's acoustic footprint is, but can I inquire about the non-technical solutions?
- Do these systems need to be in-house and in an area where the noise will be disruptive to users? (these days, this type of workload could easily be co-located)
- Have you considered a low-tech option like a cubicle wall to baffle sound (in addition to the rack)?
There is a reseller who promotes several lines of quiet rack solutions. Call and ask for more info.