Are you going to sell him? If so, it MAY be worth it, depending on the grade. You will have to get AFA to do it, send him to America and pay a hefty premium in postage and grading fees. Get 85 or 90 and you are quids in (maybe). Get 80 and you will struggle to get your money back.
If you are keeping him, ask yourself why you are grading. Will it make you happier if this figure is locked in a case that you will never see him again in and a little sticker with 85 on it then pay out the cash. How will you feel if he scores 80.
If you want to keep him nice then buy a case from GW and display him in that. It will keep him safe and you can take him out and enjoy him at any time.
Grading him will not change his condition. You know he's nice, and anyone can see that. You don't need AFA to tell you.