A few questions to narrow down choices:
How fast do you want to go down the road? Stick with your current 22-25mph or a 40-50mph machine is preferred?

Do you consider your Kubota comfortable or do you want better suspension?
Is two finger easy steering required?
How wide of a bench seat do you need (how big physically are you two and your dogs)? A 2 person, a narrow 3 person, a full 3 person.
Is a quiet gas engine ok?
Do you need the option of air conditioning?

There are several lighter duty machines out there, ranging from utility golf carts to supercharged race models. Most of them will use a CVT transmission which will save money at your annual service and allow deeper water crossings.