....goldenmotor? They look like they have a lot of options, lots of power too.
No, 13 hp continuous and a peak power around 26 hp isn't what I call "a lot of power".
Especially with the low rating torque available from those motors (less than 25 lbs-ft). I can't find the peak torque of those motors with the HPC700H controller (their most powerful controller).
If you need to keep it simple and go with a 72v system, I suggest you to use an Alltrax controller. The SPM-72500 or the SPM-72650 coupled with a 8 or 9 inches motor should give you good performance. (evdrives.com
If you need high performance, a 1000A controller coupled with an 9 inches motor will give you between 180 lbs-ft and 250 lbs-ft of torque.
With proper battery pack and if you keep the overall weight low, you can expect to beat everything on the road at low speed (0-60 mph).
You can also keep an eye on those AC motor kit who can do a good work too. http://hpevs.com/
About reverse, do you think about the idea to use a transmission coming from a small car (geo metro or other)?
And finally, please share picture if you have one!