which one to choose eh?

OK, since you already have magnets 1 inch wide, i suggest you take apart the larger motors and have a good look at the lamination cores.  In many cases, you will have a stator which consists of 36 or 48 stator slots and teeth. If you are planning to rewind the stator, i will assume you will want as many poles as possible. 36 stator slots will give you a maximum of 12 poles for 3 phase and 48 slots will give you a maximum of 16 poles. the coils span will be 1-4 ( coil sits in slots #1 and #4 ), and the coil therefore spans 3 stator teeth. This is the width that the magnets should be. if the magnets end up slightly narrow for the 3 tooth span, it will be alright. But the magnets should not be wider than the 3 tooth span or you will create some cancellation.

if you intend to use the existing winding, i suggest that you pick a motor with a higher name plate voltage rating as this will help you meet your needed charge volts with less rpm. you will also be limited to the number of poles of the winding, ( 1725 is a 4 pole motor and 1165 is a 6 pole motor). you will have to count the number of teeth spaned ny 1 coil. this is the proper width that the mags should be. if your coils end up spaning 2 inches or more( probably what they will be with a stock winding) you can always mount 2 mags tight side by side to give you the mag width that you will need.

just a suggestion, when you find a motor and know the measurements, please post again and i will try to help based on the information that you have.