Residential quality (high residential quality though). Is your budget $150
total, or $300 total? I'd plan somewhere between the two, for decent quality.
If you're going to do VPN and WiFi, I'd consider getting 3 routers.
1) VPN / Broadband with good firewall.
2) WiFi bridge "server".
3) Wifi bridge "client".
Setting up a VPN is not a piece of cake, and figuring on running a VPN "server"
at the office (Router 1), you might want to keep that function separate from
WiFi (Routers 2 / 3).
How far away are the two offices? What type of building, and how many floors /
Chuck, MS-MVP 2005-2007 [Windows - Networking]