As far as running the 6' bushhog, the 3525 will definitely run it... Mine can't hardly tell that the 5 footer is back there.
I haven't had my plow hooked up to my tractor yet, but knowing that my 8N would pull 2 bottoms pretty easily (after you get the plow set up correctly), and knowing that the 3525 is in a whole different league as far as power is concerned (even though the 8N "is" 23HP PTO vs. the 3525 @ 27 PTOHP...) I'd say that you shouldn't have any trouble pulling 3 bottoms in normal soil conditions. What size are your bottoms, 12, 14, 16"? My Dearborn 2 bottom is 2 14's, and my 8N pulls it pretty easily since I finally got it set right...Last time I used it I was plowing virgin sod 6 to 8" deep in 2nd gear on the 8N. So, I don't think the 3525 will have much trouble with 3 14's.
As far as the 8' disk... hmmm, I just don't know. When I was back on the farm, we had a 12' pull disk that we pulled mostly with the AC 190 (77HP IIRC) and that was a good match to that tractor. I'm kind of leaning toward the 8' disk being close to too big for the 3525... just gut feeling though. I don't think you would have any trouble at all with the 5525 on that disk though.
I've seen the 5525, and physically, it isn't that much bigger than the 3525... a little longer, mostly from what I remember. I'm taking care of about 95 acres (doing basically the same things you're doing) with my 3525 and it's
more than adequate. The 8' disk is the only thing that you're doing that makes me want to steer you toward the 5525.
See if you could get your dealer to bring one out to demo, and hook it to that disk and see how it does... That's the best advice I could give you at this point
