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I think your decision to go for something more than a 7245 is a good idea. I have a 7245, and at 1300 pounds of vehicle weight it is fun, but with anything heavier it would probably be sluggish.
With lead acid batteries, you're only going to be able to pull about 500 to 600 amps out of a single series string before voltage sag gets too great.
The Curtis 1221C is a 120v 400a controller, but a few people I've known complain that they tend to cut back to a much lower amperage setting (300 amps or so) after a few seconds. At 300 amps, a 120v pack is putting out about the same power as a 72v pack at 500 amps. The Alltrax 7245 is only rated for 450 amps, but my Alltrax reports well over 500 amps, and doesn't really ever heat up or have a cut back problem.
The 1231C is a 500 amp, 144v controller. It will also tend to cut back to 350 to 400 amps after it heats up, but at 144v you have more to begin with.
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