lol im having same problem about not knowing what to spend it on...ijust got some mage armor and went to the fist of guthix thing. helped get me some ideas maybe itll work for u
If you gave us a picture of your stats it would help more. I'm guessing if your rc'ing lvl is above 44 use the 3M on p ess and make nats. That will turn your 3M into at least 5M.