So, interestingly, you chose an Iseki (the Massey, built by Iseki and imported by Massey) and two LS models (LS builds both the NH Boomer line, new WorkMaster line, and the Case Farmall B lines!). The Case 50B is the same as the Boomer 50, which is a rebadged LS R4047 with the NH/Case Loader. I have both brands (Massey & LS) and I like them both. Keep in mind, the Massey 17xx series is the new Tier4 series (new emissions requirements) and will cost more (and be more complex due to emissions) than the previous 16xx series. The LS Rxxxx series, the Boomer 35,40,50 series, and the Case 50B series will all still be Tier3, which is a huge bonus if there's still any left. The Massey in my opinion is a more "deluxe" tractor but the LS ones are very reliable, and are earning a loyal & growing fan base (just check the forum here). If you are truly interested in the LS builds, either the NH or Case versions, it would behoove you to try to shop at an LS dealer directly, as the same machine will come with a stronger loader, more options (draft control and 2 standard remotes) and for thousands $$$$ LESS than the Case/NH units.
---
and hey deerseeker001... I just drove thru your state to pickup my new Massey last week. That was my first time driving thru Wisconsin. It's a very pretty state. I didn't realize it was so "hilly" with lots of nice elevation changes. Very surprised.