Network with load-balance

[polhallen]

Hi all, I need an advice to build a small network with load-balance:

dsl<–>wan|pfsense|opt1 and opt2

opt1 192.168.2.0<-->router1<-->switch1 (router1 handles 192.168.3.0 and 192.168.4.0)
opt2 192.168.5.0<-->router2<-->switch2 (router2 handles 192.168.6.0 and 192.168.7.0)

which hardware can I use to create a load-balance (a backup line) from pfsense opt1 till switch1 and from pfsense opt2 till switch2?

any suggests is preciuos :-)

thanks for help!

[polhallen]

BUMP!

no any answers?

[heper]

anything with enough network cards & other hardware that runs pfSense. (check the pfSense store or the hardware section of the forum)