sunday million - shove river?

[LooseCaller]

sb was very active preflop, calling a lot of raises and doing a lot of very weird stuff post flop. he could have a ton of hands here. shove? bet less than full stack? check?

PokerStars Game #10371500494: Tournament #51769624, $200+$15 Hold'em No Limit - Level VIII (400/800) - 2007/06/10 - 18:28:06 (ET)
Table '51769624 743' 9-max Seat #9 is the button
Seat 1: Dr.Lonsdale (66475 in chips)
Seat 2: metowetan (17075 in chips)
Seat 3: ActionJeff (14000 in chips)
Seat 4: pc831 (29700 in chips)
Seat 5: WiLDmAn75 (46850 in chips)
Seat 6: MyraEnglish (48950 in chips)
Seat 7: Cashwindfall (9120 in chips)
Seat 8: probeat (45786 in chips)
Seat 9: nbanker (23759 in chips)
Dr.Lonsdale: posts the ante 50
metowetan: posts the ante 50
ActionJeff: posts the ante 50
pc831: posts the ante 50
WiLDmAn75: posts the ante 50
MyraEnglish: posts the ante 50
Cashwindfall: posts the ante 50
probeat: posts the ante 50
nbanker: posts the ante 50
Dr.Lonsdale: posts small blind 400
metowetan: posts big blind 800
*** HOLE CARDS ***
Dealt to nbanker [Th 3d]
ActionJeff: folds
pc831: folds
WiLDmAn75: folds
MyraEnglish: folds
Cashwindfall: folds
probeat: folds
nbanker: raises 1600 to 2400
Dr.Lonsdale: calls 2000
metowetan: folds
*** FLOP *** [7d 6h Tc]
Dr.Lonsdale: bets 2400
nbanker: calls 2400
*** TURN *** [7d 6h Tc] [3c]
Dr.Lonsdale: bets 2400
nbanker: raises 4700 to 7100
Dr.Lonsdale: calls 4700
*** RIVER *** [7d 6h Tc 3c] [8d]
Dr.Lonsdale: checks
HERO: ???