If the interior, trans and engine are ok.... and it sounds like they are, I would keep it and fix the other stuff. Check for collision damge too before throwing money at it though..... seems weird to have paint work done on different panels.

What dealer did the PPI? Sounds like one to avoid if they did that poor a job on a PPI.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k