I was absolutely looking to get the best solution quality wise, but also a practical and easy to use solution while I was in your shoes not long ago. As far as video resolution goes, I think dynamic range and image quality is far more important than resolution. Yes, in a couple of years 4K will be "the standard", but pretty much everywhere you look today is 1080-displays; simply because it is good enough for most people.
The one thing about the P2V+ I REALLY love is the app. Having the opportunity to see what the camera sees and control it directly while its in air is the highest valued feature of the P2V IMO. I really can't imagine using this flying camera without using the app. The photos from the camera is not too bad, I was actually surprised over what info I was able to pull out from a RAW-file coming from such a small sensor. The video on the other hand is OK, not amazing, but not bad either. With some post processing you can get real adequate footage, but I don't think I would use it for anything too serious. I've been asked about shooting a music video for a band after they saw my first drone-footage, so I think the "less image quality minded" people amongst us is good enough.
The photos are quite good I think, I've been able to shoot some good photos with it from the sky. As mentioned, the RAW-files aren't too bad after some processing, and delivered better photos than I expected. If you want to shoot low light you can just forget about the P2V+ though, at ISO400 it looks like something out of a horror movie. Seriously, if I were able to push my Canon 5D mark II to maybe ISO124000 it still wouldn't look that bad. The low-light quality are downright horrible, but if you're not planning on shooting other than daytime I guess that's not going to be a problem.
As far as lens correction goes, there's quite much you can do with that in post. Here is a video I made with examples:
https://www.youtube.com/embed/SYqXg6VQOcY
A photo example here:
Bruskorvet hyttefelt, Maurseth by
MNYFOTO, on Flickr
I saw a video the other day while day-dreaming of a Panasonic GH4 mounted on a DJI S900:
https://www.youtube.com/watch?v=1oR-JEMV82E
It just blew my mind. A dynamic range out of this world, it almost looks like the next Far Cry game. Incredibly smooth, 4K resolution, and I guess everything you could wish for when it comes to using drone-footage commercially... Except for the price tag with it though. Still, if I were to go for a drone where I needed high-quality footage, no doubt that I would choose the S900/GH4-combo instead of a Inspire.