Right in between the CK2610 and NX6010 (both in size and cost) is the DK4510 which is what I recently bought. I mow about 26 acres of my 40 acre place which is fairly hilly. I had previously used a MF1250 (34 HP/27 PTO HP) with a 60" Bush Hog Squealer. It served me well for 27 years but the DK4510 does the job in less than half the time using half the fuel. I also purchased a Land Pride RCD1884 Dual Spindle 84" rotary mower which is easily powered by the DK. Since I use the tractor mostly for mowing on hills, I opted for the manual shuttle which leaves me 42 PTO HP. The tractor is also heavy enough for the 72" root grapple that I bought with the tractor. You may want to take a look at the DK series. I was able to add many of the niceties like rubber mat, air ride seat, telescoping links, rear remotes, with third function and grapple for under $30K.