Best bang for the buck?

Need to upgrade equipment this year. I dont have any wagons and currently bale small squares on the ground and take a crew of 5 people to pick them up with a truck and trailer then unload them onto a elevator and stack. It’s tiring but works. I also only have 2 50hp tractors and cutting with a 8’ haybine. My idea right now is to either buy two new kicker wagons or a nice self propelled stack wagon. But its been recommended to buy a bigger tractor instead. What would you recommend? I would like to get a discbine but need the bigger tractor as well to run it and the budget doesnt allow for both. Currently doing 73 acres 2-3 cuttings a year

Best bang for the buck?