Any CA M24 you'll purchase today will be the version 2 and will come with an adjustable hop up. That is one of the things that annoys me, Ken hasn't fixed his website in years. I bought my CA M24 in 2003 and I got it well used and abused, and it was a V2. I'm not sure when the V2 came out, but it was at least 6-7 years ago.
Fluted barrel model is same as bull barrel model, just looks different and weighs 90g less (barely noticable, considering once you outfit your rifle with a bipod and scope, you are well above the 12lbs mark.
And, the CA M24 is more an experts rifle than a beginners model just because it takes a certain amount of work and knowledge to get it reliable and accurate.