Commercial VPN implementation for small business?

Anyone have a good solution for VPNing about 3 windows laptops to a Win 2k3 SBS server for file access (“make available offline”) and Outlook?

We’ve been doing this via OpenVPN for years, but it’s starting to be a little flaky, either the server-side instance will stop forwarding traffic mysteriously, or some random process on the laptop (or random firewall at a hotel) will drop the packets silently.