jD balers have been my favorite for 30 years and counting. String tied can be had for significantly less than plastic "net" wrapped balers. 5' long rollers, like a JD 530, or 56x series without net wrap would be a great buy since the current rage is 4' long rolls. Each has it's finer points. Gathering wheels are a plus but not a show stopper.....just allow you to get sloppy on picking up the wind row without loosing any hay. Parts are not a problem....local JD has a good stock and parts from Dallas are just a day away.
For that baler 100 hp would be my choice as I had a 4230 JD with that baler. Wouldn't want anything less if hilly terrain. That tractor was classed as a "Row Crop" (2 steps to get up into it) and loved it's diesel...at 400 cu inches as compared to today's compacts. The 4430 was a 125 hp version with turbocharger to get the extra 25 hp and was very popular. When I bought my 1979 model, it had 3900 hrs mowing grass sitting next to a 4430 with over 10,000 hours with the drawbar hole an oval, not a circle, and the 4230 was $2,000 cheaper.