Have you looked at the units from Sonicwall? Not inexpensive, but easy to use & configure. I have a Soho Tele 3 that I use to support about 5 VPN users. The TZ170 series (.pdf datasheet) have a second port which can be used as a DMZ (I'm not quite clear if you're just looking for an end point or full Firewall/Endpoint combo, probably not reading your posts thoroughly).

-Zeke
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