Which RB for 60 VPN tunnels & Proxy service ?

Hi,

i have ~ 60 Users that have pppoe sessions to a fujitsu siemens desktop pc running RouterOS 2.9 (2.4GHz Celeron; 512 RAM) since more than 3 years. The machine seems to be slowly dying and so i need to replace it.

I thought i would just replace it with another small desktop PC, but then i saw the latest routerboards with 680 MHz (or faster)

At the moment i wonder if one of these new routerboards can be used for this service:

peer for ~60 VPN pppoe connections
peer ~6 EoIP tunnels (combined 20 MBit max.)
internet proxy for ~60 users

would it be possible to use a routerboard for this, and if yes … which one ?
thanks a lot for your input.

regards
jochen