Thanks for the reply. I've commented below.
@jql said:
Pretty generic questions here...
Best render engine - Thea! But for what quality? maybe something like Lumion suits you well it's faster to get some nice videos, but it costs as much as your new rig and it won't achieve absolute photorealism. Have you considered Blender? - Luckily I don't have to worry about photorealism too much, that's why a "one click" render engine like Podium has been ok so far. Also, my work tends to be more focussed on getting a lot done rather than perfecting one image - RenderIn has caught my eye in this regard.
Post processing for still images - might be Photoshop... just not Elements, then you could try Gimp that it's free and, in many aspects much better than that or even on some functional aspects it's even better than Photoshop (though PS is king!) - Gimp is definitely where I will be heading for PP. PSE just came pre-loaded on my current laptop