Did you start this thread on purpose, just to stir things up, or do you mean it?

As I like to play more acoustic blues and fingerstyle and I�m really in doubt , among so many models, a Martin?

If you can find one, I would strongly suggest trying a Martin 000-15S.

This is a 000-size (substantially smaller than a dreadnought, which many people now seem to think of as the "standard" size, but still fairly big), 12-frets to the body, slothead, made entirely of solid mahogany, including the top. It's one of Martin's cheaper models (which doesn't mean it's cheap, by any means, but you should get a new one for under a thousand US, or used down as low as 600) and I've seen a lot of good things written about it by blues pickers.

Peter.