Routerboard and MPLS

Greetings to all!

I want to change my x86 mikrotik pppoe server with routerboard.
It will works MPLS, firewall, for about 200-300 simultaneous pppoe connections,some routing…etc.

I think i don’t need RB1000 for now, because my main link will be 15 mbps, and that is not some very high bandwitdh.

Can i use RB 750 instead?

Thanks again!