I have been thinking about buying two mowers, an eXmark Turf Tracer HP 36 inch TT3615KAC and eXmark Lazer Z Liquid Cooled 60 inch LZ27LKA604. 1. Is the Kaw. Liquid Cooled, worth the money? 2. How is the 15 HP Kaw.? 3. I have an 04 book I think, any changes for 05? 4. How can I get an 05 book sent to the house? 5. Is the EFI Kohler as good, better, or not as good as the Kaw.? Thanks!