We (my company) are getting a T1 line in the next couple of months. I have been trying to decide what routing solution to use, and I thought I'd ask you helpful folks for suggestions. Until now, we have used over-the-counter router/firewall hardware solutions, but, because we're bringing in a faster connection, we figured that it wouldn't hurt to get a semi-beefy router in order to plan for the future. Here is what we need:

Some sort of VPN endpoint
Port mapping and forwarding
NAT
Decent firewall capabilities
(other suggestions?)


Here are some of the products we've been looking at so far:

Siemens 5940
Cisco 1700 series
Cisco 1841
Cisco 2610

The latter of the two choices seem like overkill, but I don't have that much experience in places with more than 50 users (we've grown to about 70 at this company).

Any and all help would be greatly appreciated.