Not sure what your budget is, but a friend and I went to Sawlex (sawmill expo) last year to pick out a mill to share. We went thinking we would buy a Woodmizer (10 or 15). Off in the corner was a couple of Amish guys running a weird looking blue mill, called the EZ Boardwalk. We walked over, and talked with them while they worked. While chatting, they finished their pile of logs and shut the saw off. That's when I realized that even though we distracted them, they still finished about 30% faster then Woodmizer and the others.
They said the secret was the angled carriage which uses the hook on the blade's teeth to pull the carriage through the cut. I actually saw the guy shove the carriage at the log, and it cut the whole way through without him pushing any more.
The whole setup was around $8K, but that included an upgraded engine, and trailer package.
Now, we certainly were impressed, but I'll have to admit that I ended up buying a 48" Granberg chainsaw mill for $800 instead. I couldn't justify the price, because I'm milling my own fallen trees, and nothing else. Also, I have several crotch sections at 42" that no band mill would handle.
So, if you have enough cash, and enough logs to justify, then pick from EZ Boardwalk and Woodmizer. Woodmizer will be easier to buy replacement parts from. The Amish guys obviously don't have a website, and you have to call their friend who gives them the message, but they definitely had the better mill. It was so simple, you could probably fix anything broken with a trip to the hardware store anyway.