Most of the tractors folks talk about on this forum are good machines. So in that regard it will be tough to go wrong. What brands are you seeing as you look around? What's your price point or vintage you are after? A 20yo machine for $5000 will steer this one way while a $40000 budget for a cab tractor will take it somewhere else.
When I was looking I was impressed by some of the "lesser known" (not JD, Kubota, Mahindra etc) brands like Kioti and Yanmar. The Kubota dealer I talked to was also a NH dealer- they pushed Kubota unless someone was specifically looking for NH. The "lesser known" brands also tend to fit between the premium and basic. So you can get things like tilt wheel, speed control, better loader control location with the lesser knowns for about the price of the big name basic models.
As a Mahindra owner I tend to read more about those machines. It appears the TYM built machines have been more prone to issues than others in the Mahindra line- a lot of tractors are made in part or whole by others. However Mahindra is still rated decent in the customer satisfaction study on this site.
Let us know those few things mentioned above and I'm sure you will receive a lot of good feedback!