I am thinking about buying a Sherwood Blizzard 2005 model off the web. I am new to diving and was wondering what anyone thoughts were on this choice of regulator. I do plan on diving a lot near and around Michigan. I also was reading that this is nice reg for cold water diving (Michigan). So if anyone has any thoughts, ideas please let me know. I am looking for something durable and reliable, and that will work for shallow and deep as well as warm and cold-water dives. Also when you buy a brand new regulator from a dive store over the internet, does the regulator need to be serviced before use? Or do they come serviced when you buy them?