[Hampshire] Choosing VPN routers

I am helping a small company set up VPN to enable some people to work
remotely. Sadly I haven't had much experience in this field and so it is
proving a challenge.

To gain experience I set up a tunnel at home using OpenVpn on Ubuntu as
server and a Windows XP client and got it to work after a bit of fiddling.

I had hoped to progress by installing OpenVpn on the company's
existing network, let somebody test it and if all went well add an
additional 9 tunnels.

However the existing network is part of a large building infrastructure
and we cannot access the router and are not allowed to forward any ports
so this has scuppered plan A.

We will be provided with a unique connection but have to buy own router
for the company subnet.

Having spent some time reading about the subject it looks like a
reasonable solution would be to buy a Linksys WRT54GL, load an
alternative linux firmware (tomato, or OpenWRT) and continue with
Openvpn. However this feels a bit experimental and I don't want to
saddle this company with something that could be unreliable. I think I
may go ahead do it at home just to see if it works. Has anybody done
this successfully?

The sensible solution would be to buy a VPN router which Windows could
connect to using its built in VPN client which presumably most of the
world does. I have also tried this with my existing D-Link router at
home but only thanks to a good tutorial. Has anybody suggestions for a
suitable router?

Thanks for your attention.

Roger