Cisco Routing with 2 Firewalls

I’m trying to determine how I can utilize my 2 internet circuits and 2 firewalls during an ISP migration…

What I WANT to be able to do is selectively have a route that sends all traffic from 10.1.1.0/24 out firewall 10.0.1.2, and have traffic from 10.1.2.0/24 go out firewall 10.0.1.3.

Obviously, I can’t do this with ‘ip route’ – but is there some other way to do this?

I’m using a 3750-24G as my core switch/internetwork router.