I got a Drinkwell fountain about 3 years ago... (can it possibly be 3 years ago already?) At that time, it was the only one on the market that had the extra reservoir. The photo KAK has above with Sunny shows it just right. One neat feature is that the motor can be taken apart for cleaning and it is easily replaced. (I messed up once and the water level dropped so low that the motor burnt out...) The replacement motor was about $15, as I recall.

I think your cats will love it. Both Cassy and Livvy do ours.