We have dedicated servers hosted for us by a third party, we connect to these over a VPN. My server provider uses Cisco ASA 5540 as VPN devices.

Currently we're using software clients on individual machines to connect to this VPN, either:

Cisco VPN Client
Shrew Soft VPN Connect

However, I'm looking to purchase a new load balancing router for our office and thought this could be an opportunity to get VPN client duties taken over by hardware. We could then create a permanent VPN tunnel that could be used by anyone on the network with no software client necessary. Sadly I'm not the most knowledgeable on this kind of stuff so is:

1) This a realizable goal?

Next I need to know what kind of hardware I will need. I'm not looking to spend lots of money on this (~$500), so doubtful I can afford any Cisco kit. Therefore, this is the most promising candidate I've seen (as far as my limited knowledge goes):

Draytek Vigor 2955 - http://www.draytek.co.uk/products/vigor2955.html

2) Would this be compatible with the Cisco kit my server provider uses?
3) If not, are there any alternatives I should consider?

Many thanks in advance.