I would have thought the speed at which the table should move would be dependent on what material you are wanting to cut, and the depth you are wanting to cut at. You are not giving any idea of the size of your machine - but from the pictures, I get the idea - and it looks like a metal working machine.
You are saying you want a good finish, so, regardless of the maximum speed of the table, you must ensure that the table(s) are geared so that if you are wanting to take a good cut, you have the power to do it. Have you fitted the main axis yet - what speed of travel are you thinking of trying for - I found a physical limitation on my machine - although I am ripping out the leadscrew and putting in ball screws with a hope of getting a bit more speed. Cutting is fine at 4 ipm - but waiting for the thing to traverse takes ages.
There must clearly be an advantage to standardising all you drives, so if the motors you are quoting would fit the table why not use one of them. It would give, however, a 90 ipm rotation at full speed - about 1 turn per sec - will it physically do that - is the motor powerful enough. I think I would gear that down by a factor of two.
This is equivalent to 7.5 - 9 ipm on the diameter, which I would have thought quite reasonable. It would home in 1/2 sec - I don't think your main axis would home that fast. You could even gear it down further.
I must admit I use steppers, so gearing down also adds to the accuracy I can get.
As far as homing is concerned - I think it would be more convenient if the rotary could home in both directions - you might only be a few degrees away - and certainly you would if using it manually - the only thing to bother about then is backlash (if any)