Hello, can anyone point me in the direction where I can add more ISPs to my infrastructure (I am not a AS, so no BGP) and have some sort of load balance ?
Well, should work. In that case remove nat statements for the interface where you have connected the PIX. Leave the two static routes in place.
The thing is that the router with right SW and configuration is able to do NAT, FW, and VPN just like the PIX if not better.