You probably mean PPPoE, right?
In that case, almost any Gbit capable router should do the job. I would avoid those, which achieve gigabit just barely and/or have only single core. (e.g. RB2011)
- RB750Gr3 (hEX) if you want cheap-cheap
- RB760iGS (hEX S) if you want optical fiber
- RBD52G (hAP ac2) if you want a wifi in the same box
- RB450Gx4 if you want a board with fancy features and heaps of RAM/storage (box needs to be purchased extra)
But you can also go much higher, if you expect many people to use the connection at the same time (e.g. RB4011 will handle almost anything)
if you are certain that you mean PPTP and not PPPoE, then congratulations, because you are the first person which I know of, who gets their WAN connection over slow and outdated VPN. (and in that case I have no idea which router can do gigabit PPTP)