I would spend the money on the front hydraulics and use the 8.50's till you can afford to get the 10.50's later on. That way you have both of the items you want. You really won't be able to tell a discernible difference between the smaller width. I have 8.50's on my 128 and love them. Since that is what it came with from the dealer, I am pretty sure that is what I am going to put back on it.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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