Saga 409 is a comparatively new model so it is hard to comment upon in any real detailed way. At best I can give a few first quick impressions.
Looking at the numbers, it is a comparatively heavy boat with a minimal ballast ratio, not much water tankage but a lot of fuel, and a whole lot of windage and weight aloft which is not too great when coupled with a limit of positive stability of only 120 degrees.
The interior layout is one that is well suited to coastal cruising but is less than ideal for offshore work given the large deck areas and minimal storage. While the styling of this boat is very jazzy, the 409 appears to lack the level of ventilation that is necessary for warm weather cruising.
The deck layout and rig are not really too great for offshore as well. The huge cockpit, and large plexiglass areas, absense of a bridge deck make for a boat that would be prone to downflooding. The mainsheet located on a forward arch neither gives the ease of control, low friction and minimal loadings of in cockpit boom end sheeting nor the simplicity of midboom sheeting. The rig is really a strange set up lacking the ability of a more traditional cutter to fly a staysail, and lacking a fractional rig sloop''s ability to quickly depower.
With all due respect, I would be interested in your thoughts on why you think that this is a boat with "tremendous blue water potential".
The last that I heard these boats are available through Caan Yachts in Annapolis. http://www.cannyachts.com/cannyachts/cannyachts_2.html