Using both Dynamic and Static NAT with two Different Internet facing Subnets

Question

We have two Class C Public Address subnets.  We started with Subnet (A) and have many of our Internet accessible devices on it. It is running on a Cisco PIX 515R. We bought a new ASA 5510 8.3(2) and started Migrating the Users and new servers to it so I started with our second Class C Subnet (B).   Later on down the road I found out that if the Firewalls Default Gateway is is set to a (B) Interface subnet, then the servers that are statically mapped to a (A) Address will have a (B) address when they communicate out to the internet.  So they are receiving packets on their (A) Address, though replying to them with a (B) address. 
It was mentioned that I should be able to combine static and dynamic NAT mapping to allow devices behind the firewall to have a fixed external Address when communicating outbound as well as inbound. 
So For instance I want the Following: when the Internal Replies I want the reply to come from the mapped IP, not a IP from the Dynamic Pool. 
Public IP: 192.168.1.100/24
Internal IP: 10.0.0.100/16
Public IP: 192.168.5.101/24
Internal IP: 10.0.0.101/16
interface Ethernet0/0
description 192.168.1.0/24 Network Outside IP
nameif outside-1
security-level 0
ip address 192.168.1.1 255.255.255.0
interface Ethernet0/1
description 192.168.5.0/24 Network Outside IP
nameif outside-5
security-level 0
ip address 192.168.5.1 255.255.255.0
interface Ethernet0/2
description inside 10.0.0.0/16
nameif inside
security-level 100
ip address 10.0.0.1 255.255.0.0
object network serverA_o
host 192.168.1.100
object network serverA_i
host 10.0.0.100
object network serverB_o
host 192.168.5.101
object network serverB_i
host 10.0.0.101
object network 192-168-1-NAT-POOL
range 192.168.1.50 192.168.1.239
nat (inside,outside-1) source static serverA_i serverA_o
nat (inside,outside-5) source static serverB_i serverB_o
nat (inside,outside-1) source dynamic any 192-168-1-NAT-POOL interface
object network serverA_i
nat (inside,outside-1) static serverA_o
object network serverB_i
nat (inside,outside-5) static serverB_o
route outside-1 0.0.0.0 0.0.0.0 192.168.1.1 1
route outside-5 0.0.0.0 0.0.0.0 192.168.5.1 2
When I set this up my serverB shows a Public IP of something in the 192-168-1-NAT-POOL Not 192.168.5.101
Any Suggestions?
Thanks!

Answer 1

Not sure why I have Multiple Entries. )-: I did think it was Odd. I think it might be because I looking at examples of the new and old styles of NAT.
We have a Single ISP, though have 2 separate non-Contiguous  Class C Addresses from them. We host some Servers on one subnet and some on the other. 
I'm looking for a way to use both Subnets on the same ASA. 
The Connection to the net looks like this:
Internet -> Edge Router Layer3 VLAN Switch
GE0/1.2 - 192.168.1.1 VLAN Tagged --> GE0 - VLAN Tagged
GE0/1.2 - 192.168.5.1 VLAN Tagged -^
Layer3 VLAN Switch Firewall
GE1 192.168.1.0/24 Untagged -> ASA Outside-1
GE2 192.168.5.0/24 Untagged -> ASA Outside-5
Firewall
ASA inside 10.0.0.0/16 -> Switch -> 10.0.0.100
Hope that helps clarify.
I could try to post some sanitized Configs of my PIX and ASA if needed.  But the end result I'm trying to do is have the ASA do NAT for multiple Public Subnets.