I would definitely recommend getting the Gravite 2h for f2p pking, rather than just a regular r2h. My 45/94/5 grav pure rocks, and uses a g2h/
And if you decide to go that route, use a rune sword instead of a a rune scimitar. The g2h specializes in Crush (+87) while the rune scimtar's is (obviously) slash. Therefore you'd have to switch attack styles before 2h'ing.