Rich,
I do a little square baling in the summer and my 4000 with probably around 40-45 has no problem with a massey #12 even on hills within reason. As for cutting we use a disc mower and a cheap tedder if we want to rush things. In the future when I see how things are going I plan on trying a little alfalfa. I will then probably locate a used conditioner. But as for now the disc mower is so problem free I think it will be front line for a while. I do recommend a minimum for the lighter ones around 45hp and 60ish for the heavier weight of the new holland ones especially tthe longer 7ft bars. Just something to think about.
Patrick