I'm looking at the costs of everything for my new cats, and I'm wondering how many of you would recommend Frontline or Revolution monthly for the kitties. They'll both be indoor and living with a small dog, plus I'm hoping to foster kittens sometime in the future, when Chay and Billy have settled in and gotten comfortable in their new home. I've always thought it would be a good idea to use Revolution - my only problem with it right now is that its a little pricey for the two cats, but their health would be worth the money. Should I go for it, or is there a better solution for parasite protection for my babies that isn't quite so expensive?