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No offense man, but if you need to ask what injectors to get for 800BHP then you're not ready to build for 800BHP. You'll need a COMPLETE revamp of your entire system (think in the ballpark of $30k-$50k) for that and it'll take a lot of stuff to make that reliably. Not to mention, with the weight of the car 800BHP will be basically pointless. AND that power on a 13B will come at the expense of extreme lag.
However, if you do give it a go, I recommend six of these (8 if you do alcohol). I think Injector Dynamics makes some they don't advertaise... 800-hp Fuel injectors