That is a lot of money for that compressor, believe it or not Harbor Freight has that exact same Puma compressor for quite a bit less than that.
On that outfit with that CFM rating the 60 gallon tank would probably be the best choice unless you need mobility and then the 30 gal would be the way to go, there would not be as much difference as most people think and it would keep up just as well. The largest tank available is not always the best choice and there are quite a few cheaper lower CFM 80 gallon models that could actually be better off with a 60 gallon due to the long recharge times. With a CFM range (@90 PSI) of about 10 to 16 CFM a 60 gallon tank is about right and 16 on up to about 25 CFM or so an 80 gallon tank would probably be somewhat better but less than 9 CFM really should have something a bit smaller than 60 gal. All of this of course depends a great deal on how much demand you will place on the compressor and in a small or home type shop with low demands then tank size really does not mean a lot, within reasonable sizes anyway.