Walkers are great for what they are meant to do. I you could get you a 42"or 48" side discharge deck to go along with the mulch deck then you would have you a great setup for your area. The downfall to that Walker with just the mulching deck is going to be speed. If you get some over grown areas that mulching deck is going to stink and if you get behind on the Bermuda then it is going to take awhile to cut. The Walker will give you a great cut on the normal times. If most of your stuff is under 20k sq ft that Walker with the two decks would be great.
Do you miss the Quick 36 I bought from you yet? I am loving it for my small areas.