I never use JPGs until I'm uploading to the web. They are an evil invention. The resolution is an issue because my eyes aren't good enough to see details in tiny pictures! ;)

Photomatix tone maps and converts HDRs, and it aligns multiple merged exposures (and it's arguably better at it than Photoshop CS5) -- for $39. It works perfectly well on Poser HDRs. I haven't looked to see if there are any cheaper, or even free options.

I'm not disputing the value of GC in Poser. But I found it to be a royal PITA when I wasn't using Pro. Enough of one, at any rate, to not be necessarily worth the time and (and time spent acquiring the necessary skills) adjusting all the materials in the scene pre-render.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.