Well can I overclock it with my current setup as in with the current PSU?
I wouldn't recommend it, I'm taking a pretty big risk trusting that antec's overpower protection is worth a damn...
Are you sure you want to sink that much money though? I've pretty much stalled out at this point, I think its pretty much over or will be soon enough.
You're doing two OC'd 5830's on a 430w antec, corsair isn't exactly shitty and its 600w