I'm not a pro with the pussies but at least i know some good cards.
IMO you should buy
Muze
Diana
( almost all their 5 stars are actually usable)
Clover
cherry
ditha
Jayzel is also nice
Lucy
Veronica
that's all i can think of
Go for the standard cards. In my opinion, the worst they have in them is Candice. Who isn't nearly as horrible as some of the newer cards *cough*Rhody*cough.
+1 to both of the above suggestions. I personally like how full pussy deck makes muze/cherry that much more effective (even when you overpill)
pussy cats also have some very good 2* cards so they can be real good fillers
Clint City, day.