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Basic brake down is, higher the voltage the faster you can go, more watt hours in your battery pack the farther you can go, so looking at EV design calculators you can get a good idea of what you need to reach the goals you want, then looking at EV albums and you can compare that to what other people have done and see if it worked out as planed.
There is also very little harm in going with a higher voltage because a higher voltage will stress each battery less, it will have fewer amps total on the battery cables so you can either go with smaller cables or have less line loss and when you do need that slightly higher speed it's there, the rest of the time it's not being used, the big draw back is more batteries and sometimes it bumps you up to a more costly speed controller, but most speed controller have a voltage range that they will work with so I say go for as high of a voltage battery pack as you can with while still using traction batteries, these are batteries designed for the high loads of an electric motor driving a vehicle, not the lower loads that a deep cycle RV battery might see.
Ben Nelson (on this forum) sells a rather good Build Your Own Electric Car, Cheap! DVD, well worth buying.
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