For everyday use (teaching, training), I use a Tokon Sovereign (11 ounce), which is their top of the line uniform. It's more of a middleweight to light heavyweight, and is made from a really nice brushed cotton fabric that wicks away perspiration, while also being quite durable.
I also have one of their 12 ounce Tokon Europa uniforms, which is almost as nice as the Sovereign, but not quite as refined. Still very comfortable.
While these uniforms cost significantly more than your entry level ones, they're much more durable, and you're going to feel a lot better training in them, because they breathe more easily, and keep you drier than the cheap ones that cling to you...
For the students, we have a middleweight gi that uses 8-9 ounce 100% cotton fabric (similar to the Tokon Kodomo). Durable enough to last for a while, they don't cling to you, and they'll also stand up to light grappling drills, too. Again, while not as cheap as the paper-thin Century ones you can buy off the internet, they're a lot more durable, and there's no sense in making your students miserable.
For people looking for a nice gi, but don't want to pay 250 for a top of the line Shureido (it's worth it, though), my short list of recommendations:
Tokon Europa - 12 ounce brushed cotton
Arawaza Sapphire - Essentially the same as the Tokon Europa, actually slightly nicer
JUKA Bronze - Again, similar to the Europa, a bit lighter.
These uniforms sell from 95-125, if you look carefully.