$$$ league - stacked team - where can I upgrade?

[Bosy Billups]

C - Soto
1B - Pujols
2B - Cano
3B - Wright
SS - Hanley
MI - Weeks
OF - Bay
OF - Hart
OF - Wells
OF - Delmon
Util - Taveras
Util - Hermida
B - J. Upton
B - B. Butler

SP - J. Santana
SP - Halladay
SP - J. Shields
SP - Liriano
SP - Greinke
SP - Wainwright
B - Pelfrey
B - S. Gallagher

RP - Lidge
RP - Fuentes
RP - Ray
RP - Devine
RP - Corpas
RP - S. Downs
RP - C. Perez
RP - Kuo

This is a 11 team, 15 player keeper. 6x6 with Holds, BBs, and OPS (instead of average).

Stand pat, or look to upgrade?

Thanks!