The first thing to consider would be if you use any auto-routing protocols -- if you use EIGRP instead of OSPF or BGP, that's a Cisco-proprietary protocol and you should stick with Cisco equipment.
Two other options:
The Netscreen 5GTs (the smallest units) aren't very expensive and have many options including wireless (I believe - I've never used a wireless unit) and built-in ADSL. The VPNs are quite stable, the company I work for have several installed in outlying areas doing what you wish to accomplish.
Another option would be some of the Mikrotik router hardware. The nice thing about this option is the hardware is very good, and extremely configurable. Depending on the board options you choose, you can add wireless cards, multiple gigabit ethernet ports, outdoor cases... the hardware is as close to "bulletproof" as you can get outside of Cisco, but much less expensive. I have wireless routers that are 8 years old still doing their job. Remote access options are top notch.
There is a downside, though. They have their own command system, and configuration is a learning experience. Once you learn to speak Mikrotik, it's very nice, but there is a bit of a learning curve, much steeper than the Netscreen units, about the same as Cisco, but if you already speak Cisco... ;-) However, I have never used the VPN options on the Mikrotik units - I know the OS will do it, but I don't have any knowledge / experience on that area of operation. I've used the units as standard Level 3 IP routers (wired and wireless) and as hotspots.
Hope this helps!
Roger "Merch" Merchberger
