What kind of ducks are you hunting and how much are you looking to spend?
The best budget beginner mallard call system out there is the buck gardner double nasty 2 with the dvd and sound keychain. I think it's $25 and it sounds beter than any call around its price.
If your looking to spend alot more theres to many calls to list and they all sounds great. The only goose call I own is a mick lacy goose flute and it does the job but i rarely hunt geese.