You might look at Snapper Pro S150XT 48" or 52", or Snapper Pro S200XT 61" or 72". They are basically Ferris mowers without the suspension at a substantial $ cost savings. They have the same ICD cutting decks as Ferris and feature the large Dual Hydro-Gear Commercial ZT-5400 transmissions. I bought a S150XT 52" kawasaki FX730 24hp shown in first picture (S150XTKAV2452) It's built like a tank. The S150XT and S200XTi are the only mowers I found with the 5400 drives that are in the SAME price range as most mowers using the 3400 drives. Ferris quality withou the fancy suspension. I know, I researched before I bought. Positively more bang for your buck. Ferris, Simplicity, and Snapper Pro are all owned by Briggs and Stratton, but are separately run companies.
Just my 2 cents
Eric
Pictures are S150XT, S200XT, and a Ferris S2100.