If your wanting to run 90” finish mower and a Brushcat, I would hold out until you find a 5610 or are able to spend more. I really feel higher radiator location and not being covered by a bed help with cooling and makes it a lot easier to keep radiator clean. I found my 2013 5610 used with less than 200 hrs with a 90” finish mower in early 2015. I have about 10-14 acre area at my farm I mow with it. With area and number times I’ve had to mow in a year, I’ve mowed almost 600 acres with my 5610 and have put anther 800 hrs on. Unfortunately, I gave closer to $50k with the mower and a bucket. I’ve since bought a rental Brushcat 72” too. 5610 handles the Brushcat well.
Don’t know how much mowing you have to do, but you’ll want to put some screen over your AC condenser, at least when mowing. Material and dust from mowing will plug it solid. Now when I mow every 30-45 minutes I may have to stop and knock the screen out. When cleaned my condenser out midway through the first summer, it took a few hrs and I ended up pulling air filter box and condenser fan to clean from both sides to get it cleaned out.