Get a router with enough flash and ram to run dd-wrt with openvpn. Be sure to get a compatible model with no outstanding issues. I use the good old WRT-54GL with openvpn and configured using the webui. It works fine (it's been over one year) I use it to access my pc's and nas and also my wife uses it when she needs a secure connection when on free wifi as she travels quite a lot.

Drawbacks: the old wrt-54gl has a slow cpu and so I don't reach over 700kb or so. It's enough for my needs but they might not be enough for you.

Let us know what you choose in the end.