Have you looked into a Hustler Superduty 54"? That would be an ideal machine for you. There have been quite a few members that bought the Super Duty 54" for about the acreage you have and they have been very happy with the purchase. The BadBoy PUP would be a great machine aswell, the Kohler engine will be fine. MS Surveyor owns one and has been very happy with his and he cuts some major acreage. You could also look at the CZT series, I have the CZT and it would be ideal for 2 1/2 acres. You could save a few bucks dropping down to the CZT with the 50". It has the 23hp Vanguard engine and run strong. These are all great mowers for 2 1/2 acres. It seems however that you have your mind set on a Kubota, I am not a fan of Kubota at all, but there are guys that pop in here and own them and love em. I am sure if you go that direction you will be happy.