Please tell me that those numbers +200 +100, -100, -200 aren't the uma bonuses...
Because if so then you need 5200 points (40 fu 3 fan or just 4 fan+) or a 2600 point direct hit on the player across (40 fu 2 fan or 3 fan+) to not go negative by a lot just from uma bonuses alone. (Player sitting at west can get a direct hit on the dealer, thereby bringing a "sudden death" south round in a tonpuusen game is another possibility. Unfortunately East is leading in points so if it ends up being a draw with him in tenpai, the game will still end instantly.)
...apparently it seems there's a 200 point difference in uma bonuses/deductions between 2nd and 3rd place ...
Taking that into account, it's either praying for uradora/tsumo/ippatsu after a riichi or going for a honitsu of manzi since I see you already tossed some pinzu.
They both look like pretty bad choices.
With the riichi route, the haku are most likely going to stay as a pair (if the haku is pon'd, the hand will be stuck at 1 fan (unless honitsu) or 2 fan if you draw the 7 or 8 manzi and go single wait) so you'll just get riichi +1 for sure and the possibility of ippatsu, tsumo, and ura dora. Of course, if someone kans or lays down more riichi sticks, that changes things also.
Honitsu will take a while but if you draw the dora and pon the haku, it'll be 4 fan, giving you a sure shot at going in second. If kamicha decides to riichi (since he technically has nothing to lose seeing that the game is basically based off of placement due to uma bonuses) then he'll basically feed you all the tiles you need to chi later on. (He needs a haneman direct hit on dealer or tsumo to come in first.)