Possible hardware vendor
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At work we had some 1U servers providing wireless security awhile back, the company has sense went belly up and so we did what came naturally, mod em! Anyway found out who the original hardware vendor is and they do offer some decent boxes which could be used for pfsense http://www.advantech.com.tw
The boxes we ended up with are 1u's with quad intel 10/100 nics, a celeron 1.2ghz, 256megs of ram, and a compact flash slot:)…..modded it a bit and added wireless and usb....the device works perfect!