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Cisco ASA Failover 5 ISP Connections?

HI -

I have a pair of Cisco ASA 5510's setup in Active/Standby mode.

At the main office there are 5 ISP connections. They are used as follows.

ISP 1 - Internet
ISP 2 - SAN Replication
ISP 3 - VPN for remote staff
ISP 4  - Multiple bonded MPLS T1's for branch access (Terminal services and IP phones)
ISP 5 - 4G Internet (Not currently used)

Can i have each ISP connection failover to the ISP of my choosing? For example, I want ISP 1 to failover to ISP 2, and if ISP 2 is down then have ISP1 failover to ISP 5.

Can a failover link be active while waiting for failover? For example, can ISP 2 be active for SAN replication while it is waiting for ISP 1 to fail and if ISP 1 fails I don't want it to interrupt the current activity on ISP 2.
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Why would I have to use something like a 2921 router prior to my ASA? Can't i utilize a spare 3750G switch to connect all my iSP connections, then put them each on a VLAN and finally a Trunk to each ASA?