Go to Wal Mart and get 6 cans of degreaser and spray it on while shes warm but not hot let soak and spray off... If you get it clean you might get an idea of the severity of the leak.
Here are my guesses:
Camshaft seals will be most of the drips on the oil filters and the radiator hose. Might as well count on valvecover gaskets. If you are doing cam seals, you might as well throw a timing belt kit with cam and crank seals, water pump and tensioner on there, fresh radiator hoses (oil does them absolutely no good) Ballpark $300-$400 for those parts.
Looks like an axleshaft seal on one of them.
If your cam seals are going, check your timing belt... Could be oil fouled.