[KLUG Members] Dual internet connection devices?

[Adam bultman]

Greetings.

I've been tasked with assisting a customer figure out their internet
connection for a new product they have purchased.

The purchase of a product means that their data and work isn't done
in-house anymore, but via the internet.

They currently have a verizon DSL connection which isn't the most solid,
so they've been thinking of getting comcast cable as their 'second'
connection. Both would have static IP addresses.

Currently, they use a windows box to provide firewalling and NAT, but
the version they have (ISA is what the guy kept saying) doesn't handle
two different connections.

My initial response would be 'cisco', except that this guy is a
Microsoft guy and might not be the most comfortable with fiddling with
configs, or waiting for me or another admin to call up and walk him
through things.

Are there easy, hardware-style products that'll help with this?  He
mentioned ZyWall, which will do both dual internet connections and VPN
(which is required - he will have a VPN to us).

Any suggestions, stories, or anecdotes?

Adam