well, I would say just leave it...it's already great enough as it is, going for another xtra few damage isn't worth the money you've already invested into that weapon. BUT, by the laws of greed, if you go for +4, you MUST go for +5. If you go for +6, you MUST go for +7. If you go for +8, you MUST go for +9. So, I wish you luck my friend.
