I want to buy a Lazer Z 60" cut. The best deal is on a 23hp Kohler. I'm concerned because most brands offer the 60" cut standard with a 25hp Kohler. When would it benefit me to order an eXmark with the 25hp? It is approx. $1,000 additioal cost. Is there a way to block debris from coming out of the side discharge without buying the mulching kit? Thanks.