Make sure you get dealer prices for any of these tractors -- the Kubota B2920 should end up being quite a bit less than the Deere 2520. The best deal I got on the 1026 was $14600 for the tractor with front loader. The B2620 with front loader was only $100 more, at $14700, and the B2920 with front loader was $15400. If I remember right the Deere 2520 with front loader was around $18000 or so.
The B3200 does vibrate quite a bit more, since it's a 4-cylinder. They are never as smoothe as the 3-cylinders in my experience.
The dealer told me $15,400 for the the 1026r with FEL, balast box, and the 54mmm with auto connect. The Kubota dealer told me today that the B2920 with FEL, and MMM would be around $19,000. The John Deere dealer told me 2520 with FEL, 60" MMM, balast box would be $20,400