Design Targets:
Layout 1: iPhone (320/640px) in Portrait is a good candidate for the PSDs. Since this is often a fluid width layout, it can grow or shrink in width to fit other devices in this layout.
Layout 2: iPad (768/1536px) is a good choice for the PSDs here. This layout can scale to fit other devices with the same layout.
Layout 3: Desktop full width (960px) fixed-width with a background generally makes the most sense for PSDs.
if budget allows to create 4 layouts, then
Layout 4: Desktop HD full width (1350px) fixed-width with a background generally makes the most sense for PSDs.
