I have a blown Kohler Courage 20 model SV600S, Spec SV600-0024. Are there better engines out there that I can replace this engine with for about the same price?

Hi,
Could easily be. Try one of these:
Small Engine Suppliers - Your online source for Replacement Small Engines, Tools & Parts (http://www.smallenginesuppliers.com/)
Small Engine Warehouse - Repower Outdoor Power Equipment (http://www.smallenginewarehouse.com/)
Small Engines - small engine - Welcome to Small Engine Distributors, The Dealer's First Call Source for Lawn & Garden Supplies. Contact us at [email protected] or [email protected] - Our wholesale website is http://www.sedkc.com & ht (http://www.smallenginedistributors.net/)
Tulsa Engine Warehouse is your source for small gas engines such as Briggs & Stratton, Honda, Kohler, Kawasaki We have complete small gas engines and also lawnmower parts for gas engines. (http://tewarehouse.com/)
Peace,
Clarke