Okay, so I have my rig and love it but want MORE POWERRRRRRRRRRRRRRR.... So I wanna crossfire, At present I have a Sapphire Toxic 5850 2GB and I love it, fast and reliable, but I want MORE!!!!... so I was thinking of a card to crossfire with it, maybe another Toxic 2GB, I can find one for £305.00 or I can get a 1GB Sapphire 5870 for a bit more £330.00 Money is an issue and I wont get it right away but some suggestions on what to crossfire it with would be lovely. I was thinking a dedicated PhysX card but then that means new monitors etc.. Cheers!