I did a search on this topic but didn't see anything, so I thought I'd ask. Is there really a compelling reason for getting an engine with the extra 3 HP? It appears that a lot of LawnSite members have bought the Quick 36 and therefore must have made a decision regarding which size engine to get. Would you share with me what pushed you in which ever direction you took? And for you who got the 13 HP, did you regret it and would you choose a 16 if you could do it over again?