As far as a soft centered bale, I don't think that would have anything to do with the "cure" factor. The hay better be "cured" before you bale it.
That's just sales hype as far as I am concerned. The one advantage to a soft centered bale is that you can spear it easily to move it. Klauus is the only other bailer that I know of that rolls a soft centered bale.
I use a New Holland 638 rounder. I bought it new last year and paid a little under $11,000 for it. It rolls a 4 square bale. We run the smaller bales as we sell to the Amish and they need a bale that they can unroll by hand and that 2 people can move around.
I am not at all familiar with a Manhindra tractor, other than the seat on the tractor is from the dark ages. With a rounder, everything is dependent on PTO horsepower. With a 4 square bailer you need at least 45 PTO.
Whatever the PTO recommendation that MW recommends, you will need at least that. Usually, the recommendation is for haying in ideal conditions. If your moisture climbs or if you are bailing grass type hay or wheat straw, you will need more PTO horsepower.
Understand, with rounds, you will need some equipment to move them and store them. You will need a FEL that's capable of lifting the bale as well as a bale spear and probably a rear mount spear as well.
We store our bales outside under hay tarps, elevated off the ground on pallets.
With the MW, does the price include twine and net wrap? Net wrap is very convenient, but costly, about $1.50 per bale. We twine wrap, not net.
You can also sleeve your bales if you wish. Tarping, however, is a lot cheaper.