Finally I quit lurking....
Ok, I've been lurking these forums for a long time...but finally someone brings up a topic I know something about...I kept thinking I should register...but no one has asked about boots...
I am extremely hard on my shoes...i tear up everything I own extremely quickly...In the last 3 years I have had a pair of justin work boots, a pair of wolverine work boots, a pair of thinsulated Rocky boots and an uninsulated pair of Rockys (none of these were lace ups...don't know much about that department).
The Justins have held up pretty well except they leak (don't know if they were intended to be waterproof to begin with.) They are relatively comfortable and have an extremely durable sole.
The wolverines were the most comfortable boots i've ever put on in my life...except the soles split after 2 months and wolverine refused to replace them under warranty citing "excessive abuse" - which is the reason I don't work in Nike's(I thought work boots were supposed to take abuse).
The Rocky Boots have been my personal favorites. I have the wellington model which is a slip on waterproof leather model with a nylon and leather upper. They are pretty comfortable and very waterproof (the waterproof part is a big selling point for me.) The ones with the 200 gram thinsulate make a suprising difference in cold weather but get pretty hot in the summer (i'm from mississippi - 100 degree weather may not be an issue for you). That's why I bought an unisulated pair as well. I have been very happy with them.
These are the only boots I've tried, I'm sure many others have suggestions for boots that have worked for them. Good Luck!