Im thinking off putting an after market oil cooler on my gsxr indy is the internal oil pump man enough for the job if im putting the cooler at the front of the car or do i need to think about another oil pump?

The pressure drop across an oil cooler is small compared to the pressure drop across your engine.
So just use the standard pump. Mine is an 1100 but it works fine in this configuration.

What size cooler do you reckon will do the job 13row or bigger?

Mine is 235mm wide and 16 row, with a Mocal thermostat.
Not based on anything other than it looked about right!
I don't monitor oil temperatures.

I run a 16 row and get oil temp of around 85 degrees on the road with slightly more on track or in traffic. If you are worried about it I'd recommend the upgraded pump gear if you don't already have it(easy to put in behind your clutch plates)

im trying to sort out some aftermarket parts to join onto the engine at the mo and will probably go for the cooler that fits best under the rad.