Vokoun has been a full time starter for 3 seasons:
02/03 - 68 Starts, 25 wins, 2.20 GAA, .918 Save %, 3 shutouts
03/04 - 73 Starts, 34 wins, 2.53 GAA, .909 Save %, 3 shutouts
05/06 - 60 Starts, 36 wins, 2.67 GAA, .919 Save %, 4 shutouts
DePietro has been a full time starter for 2 seasons:
03/04 - 47 Starts, 23 Wins, 2.36 GAA, .911 Save %, 5 shutouts
05/06 - 62 Starts, 30 wins, 3.02 GAA, .900 Save %, 1 shutout
Vokoun got sick for the last 1/4of the season last year or his numbers would have been even better. I don't know what you know about him but he's widely thought of as one of the better starting goaltenders in the NHL. I like Depietro and think he could EVENTUALLY be a very good #1 goaltender but calling him better then Vokoun is rampant homerism.
BTW, before you talk about DePietro's leaky defense, save % is the best indication of a goaltenders play. Vokoun's lifetime save % is .912 (in 256 career starts), DePietro's os .900 (in 137 career starts). That ends the arguement from my point of view.