I will vouch for Icast. Their bandwidth has been solid, and the techs know their stuff. Im not impressed easily. I was impressed.
But yeah, Win MTR over regular traceroute. You will see some nice spikes to indicate issues, and you can leave it on, and have it consistantly monitor, so if you run into issues (like peski ISP choking bandwidth from your local ISP DC to save electricity, grrrrrr) you can call them up with some hard documentation thats graphic, so they can wrap their skulls around your complaint.