What size brushcat for T200??

[siduramaxde]

I have been considering a brushcat for some time now but I don't know what size my machine will handle. I have a regular flow T200 ( ~21gpm). I think the brushcat comes in 60" and 90". I want the 90" but I'm not sure the machine will handle it. The machine is nearly 80" wide, so a brushcutter smaller than that would not be good. I would be cutting mostly 3' tall grass and maybe some small saplings (less than 1"), all on fairly flat ground. Also, I want to be able move 5+ mph. What are my options?
Thanks
Rod