Sorry for the late reply, got busy with work and with yard work. Thanks for the reply everyone. I don't know much about the F Series other than everyone seems to say this is the mower for slopes. I see they only come with Turf Tires and I think that'll be an issue...I'll get into that later.
So I think I should start with what I have to mow and then let you, the experts, tell me whether the F is for me or not. If I'm going to shell out this kind of cash, I need it to do everything without a doubt.
My "weekly" mow around the house is about 3 acres. If I were to get this machine I'd probably add another acre, possibly. I have another ~3 acres that I mow with my Kubota
B3200 with a 3 point Woods finishing mower. That part gets done around once a month or so depending on the weather, as part of this land is slopped near my pond and the banks are pretty steep, so I stay away with the
B3200. She just feels to narrow and tall. The pucker factor goes up and the rear sometimes does want to slide with that 1,000lb Woods mower behind her. My tractor has R4 tires on them, or "bar tires" or "semi-ag".
Mowing around the house is pretty easy. Out front there is a decent little hill that runs alongside the road, which I mow along with my Grasshopper (with Chevron tires). She crab walks but she gets it done. If I think it's the slightest bit wet, I don't mow it since I'm right alongside the road. Here is a picture:
Right now I do not mow that section up and down, as when they put drainage along the road and my lawn, there is an asphalt "lip" which the deck would hit. (The ZD326 I demo'ed went up and down just fine, especially with the hydraulic lift deck). Not sure how I would mow this with the F? Since the F deck doesn't rise, I would think I'd have to mow alongside the road? But then I have issues with the electric pole and guide wires. (I mow between these now as my Grasshopper doesn't have a ROPS). I'd have to stop. Turn 90 degrees and head uphill? Might be an issue.
Now the fun stuff, my pond.
I took a few pictures with my Polaris Ranger and put an angle meter on the floor boards, I figured this should get it fairly close.
This is the "easy" bank.

I either back the Kubota with the mower to the water, or very carefully do it with the Grasshopper. Just in a few spots since I'm not real comfortable at the moment doing either. I have sandy soil, so I don't want to go a sliding.
This bank shot read 18 degrees.
Now the fun part. Here are a few shots of the dam:


The steepest point of the dam measures at 25 degrees. The bottom of the dam there isn稚 much of a level surface and it drops off into a small stream. I was able to mow this with the
B3200, however if the dirt was damp, she would spin because I think she was trying to pull the Woods mower and didn稚 add weight to the rear tires. We mowed this up and down. We found it easier to mow down hill and then drive back up and around, then back down again. This is where I think the Turf Tires might not be good enough on the F Series.
I do not think I can mow this side to side since this is more 澱owl shaped and that would mean at certain spots, the mower could have the wheels on different angles as it travels across the curved section. I think this could big a slide point.
Here is a shot of the bank at the top of the dam. I壇 like to be able to drive towards the water, and let the deck angle down (negative angle) towards the water. Will the deck angle down at a negative angle?
Sorry for the long post. Let me know if you have questions and I値l try to clarify.
So my questions are:
1) Will the F series do everything? Most of it? Will I need different tires?
2) Buy new? Best place to look for a used model?