For haying tractors handiness is more important than pure power. I am a diehard red fan but the shifting in the 56, 66, and 86 series is a major detriment to handiness. I am not a White fan but they do not have a lot of fans so you can get a better condition tractor of this brand for less money and they do do handle well. i saw a nice looking 2-105 at auction go for under $5000 a year ago and it only had 4800 hours on it. One step back from White to an Oliver 50 series can be a nicer low cost older tractor. I have never been much of a Massey fan of that era but the Case 70 and 94 series can be quite handy as well. Sometimes you can find a 30 series green one fairly reasonable as they were not the most well-liked tractor. They are a good handy smooth running tractor - just not a puller but for haying they would be fine.
As for turbos - i would not worry at all if the tractor has not been pulled hard and looks like it has been taken care of.