If you have low funds, do not purchase the Spinach. It does not speed up your pulling power enough to make that much of a difference to your total. If you have low funds, do not purchase the Speed Engine. All it does is move the boat side to side slightly faster. It is not worth purchasing the Armor until the third round, There are no pirates or other marauding attackers until then. Goldie's cannon is usually a useful purchase, especially on rounds with large rock obstacles. However you may not get more than one chance to use it. Buy it when it is cheap.