The A's had a great 2006 season.  They should be very proud of their accomplishments despite a slew of injuries.  This has to be considered incremental progress for the Beane/Macha era as they finally won a playoff series against an excellent Twins team.  The AL will be loaded next year as the big market failures(Red Sox, White Sox & Angels) will be spending like drunken sailors in the offseason.  I think that the following team could compete with a bit luck:

C...kendall, Jeremy Brown
1B...DJ, Craig Wilson....cheap platoon
2B...Ellis, Scutaro
SS..Crosby, Scutaro
3B..Chavez, Bocaccica
DH...Thomas
OF..Bradley
OF..Kotsay
OF..Kielty, Catalanatto...cheap platoon

P..Harden
P..Haren
P..Blanton
P..Loaiza
P..Mulder...given him an incentive laden deal as he tries to salvage his career

RP..Street
RP..Duke
RP..Calero
RP..kennedy
RP..Gaudin
RP..Saarloos
RP..Flores

I think that the roster above will keep the A's on budget and provides the necessary upside to win the AL West again.