Default VPN ROUTER DD-wrt

HI Fellow Enthusiasts
1) I am looking to purchase a VPN service from Private Internet Access any thoughts, is it a good provider?

2) I am buying a ALL in One HP PC to use with this

3) Which router and DD-wrt should i purchase.

any of your thoughts and ideas are most welcome please keep it so i can understand it (NOT TO TECHNICAL FOR ME LOL)