If you're not low-carb, then I can't see the problem with sushi - avoiding the caloric sauces and sticking to fish and veggie stuff - it's all pretty low calorie. I guess with soy, etc it could be pretty high sodium.
Lose 25lbs by 15 April (10 Mar)
Get to 100 kg (220) by 1 May (7 Apr)
Be 205 by race day - 14 July
One-derland by 1 Sept