Jim_C,
You might want to think about first purchasing a mower and rake. You can usually find a custom operator for hay baling. Your DK45 has 38 PTO HP and would be ok for square baling but only enough HP for the smallest round balers. Your options for a mower:
1. Single Action Sicklebar mower- There are many good used single action sicklebar mowers available for $200-2,000. The down side is they will mow only when the grass is dry. That means missing work to mow because you will have to mow between noon and when the dew falls. These mowers are old technology and are best used to trim around the obstacles of your farm.
2. Double Action Sicklebar Mowers- The double action is an update from the single action in mowing capacity but not durability. These mowers are designed for clean fields without rocks, sticks, and branches. If you want to try a double action mower there are many of them available from customers trading them in for drum and disc mowers. New $2,000-3,500
3. Drum mowers- Designed to be the most durable type mower, give you the cutting technology of a disc mower at an affordable price. New $2,000-3,500 They will mow ant type of hay in any conditions. The advantage is the drum mowers will mow at any time of the day so the heart of the day for curing hay is not wasted for mowing.
4. Disc mowers- You are limited to a few mowers because of your 38 HP. The shaft drive mowers require less HP than the oil bath and gear cutter style mowers. You have the HP for a 7' Lely, New Idea, or Vermeer disc mower. New $3,800-5,000
5. Haybine- You still are using a sicklebar knife to cut the hay so you still have some of the same problems and single action mowers have. These mowers will condition the hay helping some with drying time but it is a wash on time saving because you will have to wait until the dew burns off. Used $1,000-$5,000 New $9,000-$15,000
There are many style rakes available that will do the job. New Holland 256 is the standard for roller bar rakes. If you want to save time and be able to rake a 10-20 acres an hour ten look ate the V-Wheel Rakes. They rake from 18'-30' at one pass. New $1,900-$3,500 The single side wheel rakes are available for $500-$3,000 and rake from 8'-15'.