Hi Eric,
Try this out and update if it works
interface s0
ip address
ip nat outside
!
interface s1
ip address
ip nat outside
!
interface ethernet1
ip address
ip nat inside
!
ip route 0.0.0.0 0.0.0.0 s0 90
ip route 0.0.0.0 0.0.0.0 s1 100
!
ip nat inside source list 1 route-map ISP1-map interface s0 overload
ip nat inside source list 1 route-map ISP2-map interface s1 overload
!
route-map ISP11-map permit 10
match interface s0
!
route-map ISP12-map permit 10
match interface s1
!
access-list 1 permit host X.X.X.X
HTH
Ankur
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