. . specifically for that purpose, particularly Cisco and Sonic Wall, I don't think I've been mislead in purchasing "VPN routers". With hardware VPN firewall routers the encryption overhead is handled by specialized chips, not by the PC's CPU - much more efficient.
Window comes with VPN software using IPSec that allows connection to hardware VPN devices remotely, which is particularly valuable for mobile users, but for a stationary site it's a lot more efficient to let the hardware do it through a dedicated router-to-router tunnel.
I just haven't done this before so I'm not real familiar with the fine details of making it work.