Thinking of taking the dive....but confused

I have printed a couple of A2 sized images from my DP1x, look great unless you are looking at them from a few inches away.

DP1 - 28mm Equiv. f4.0 Lens with 4.6mp X3 (20.7 × 13.8mm) and TRUE Image Processing Engine

DP1S - 28mm Equiv. f4.0 Lens with 4.6mp X3 (20.7 × 13.8mm) and TRUE Image Processing Engine

DP1X - 28mm Equiv. f4.0 Lens with 4.6mp X3 (20.7 × 13.8mm) and TRUE Image II Processing Engine

DP1m - 28mm Eqiv. f2.8 Lens with 15.4mp X3 (24 x 16 mm) and Dual TRUE Image II Processing Engine

DP2 - 41mm Equiv. f2.8 Lens with 4.6mp X3 (20.7 × 13.8mm) and TRUE Image Processing Engine

DP2S - 41mm Equiv. f2.8 Lens with 4.6mp X3 (20.7 × 13.8mm) and TRUE Image II Processing Engine

DP2X - 41mm Equiv. f2.8 Lens with 4.6mp X3 (20.7 × 13.8mm) and TRUE Image II Processing Engine

DP2m - 50mm Eqiv. f2.8 Lens with 15.4mp X3 (24 x 16 mm) and Dual TRUE Image II Processing Engine

DP3m - 75mm Eqiv. f2.8 Lens with 15.4mp X3 (24 x 16 mm) and Dual TRUE Image II Processing Engine

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