A 750 with annular boosters would probably be a great choice. (yeah, I know, everyone's shocked. I'm suggesting a 'big carb!') Thing is, with carburetors, it's not just about how many CFM they are labeled with, but more about how well they can deliver a stable stream of fuel, and atomize it properly. Since you're dead-set on a double pumper (which actually is a kind of a lousy choice for a street only car by the way), best get one that can actually deliver peak performance with a very low pressure drop at WOT, and still get the fuel mixed properly.
Just make sure you shell out for the annulars. With the normal boosters, I think you'd be disappointed in basically every aspect of the carb *except* WOT.
If I were in your shoes, and just burning to get a different carburetor, I'd get this instead: Summit M-Series 750
It's vac secondaries, easier to tune, and would deliver better part throttle response and economy, hands down. Similar peak power, too. Or, just tune up your existing carb and figure out what the performance lag actually is. I'd start with having your dizzy's timing recurved by someone who knows what they are doing. Very rarely is a bog related to the secondaries not opening as they're supposed to. Double Pumpers are not known for fixing 'bogs', but more typically create them. Since they don't care what your engine actually wants, fuel-wise, they just drop the manifold pressure to 0, and rain fuel. When it comes to full throttle, the engine eventually figures out what to do, and goes, hopefully starting to draw fuel from the venturii before the squirters stop shooting. At part throttle though, a double-pumper is pretty challenged to come up with the right combination of fuel and air at any given time, and is usually a poor compromise of both.