Need some opinions on the best litter for my Sammy. There are so many types and it gets a little confusing. I know as he gets better he won't urinate so much, but in the meantime... They all seem to have their pros and cons, but anyone who's had a frequent pee-er knows what I mean. I know some litters cost an arm and 2 legs, but does that make them better? He has no allergies and adapts quickly to just about anything. Any thoughts?