site to site VPN

I have a Watchguard x750e in the office that I am trying to establish a hardware based VPN with.  Pretty straightforward.  Herein lies the problem:  I am looking for a non Watchguard appliance to do this with.  Since setting up VPNs through different manufacturers can be kind of tricky I was wondering if anyone here has any first hand experience setting something like this up.  So basically I'm looking for a recommendation, something as inexpensive as possible.  The cheapest appliance from Watchguard is like 300-400 dollar range.  I'm looking to go with an older type/model of something that I could snag off of eBay.  I will need about 4 of these appliances and the budget is rather tight.    

The ultimate goal here is the need to get a Panasonic VoIP telephone working from outside the office.  I hope that is enough info.  What do you guys think?  
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If you're on a budget you may want to look at Draytek, not brilliant but can do site to site IP Sec tunnels, PPTP, IPSec and L2TP VPNs
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
VoIP over VPN is overkill, and usually reduces quality (by introducing additional lags) thru the additional overhead introduced. However, creating a hardened and secured VoIP access from external is often a bigger challenge, so it is not uncommen to tunnel VoIP thru a VPN.

The issue then is that you need a better device to make it a decent experience. Low budget devices will (often) not suffice. So you indeed need first-hand advice here which reasonable priced devices will allow you to perform your task.
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joshcallahan1Author Commented:
@marine7275:  Have you had any experience setting up any specific type of Sonicwall with any Watchguard device?

@Netflo:  Thanks for the suggestion I will check them out.  As I asked marine as well, have you ever setup one of these up with a VPN through a dissimilar device?  

@Qlemo:  Overkill or not the physical phones will connect to the PBX at the office without a VPN.  Even the softphone version (which has been ruled out by management) also needs this to facilitate connectivity.  If you have any other suggestions how to hook these phones up outside of the office without using a VPN I'd love to hear it.  
As you mentioned, connecting VPNs from different manufacturers can be tricky, but usually can be done.  Our org. hasn't had much trouble with the Netgear FVS338 or the like.   Snapgear (now part of McAfee?) was also very good, though more $$.  See if you can pick up one of those on ebay.
Yes I am familiar in connectivity between the Watchguard x750e and Drayteks, they do work and are stable.

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As posted earlier, Drayteks and Watchguards can be connected securely. Whatever traffic passes through, providing there is enough bandwidth VoIP will be fine.
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