Then at the moment I would definitely suggest the Flex or oddly enough the M7, and a Note 3 is still on the table.
M7: Interface, screen, similar camera and well understood issues. And suddenly it seems like they're $0 on contract at all the shops in my area. And don't forget the speakers tho of course the M8's are even better.
G Flex: Arguably the sleekest phone you would ever consider not putting in a case, between the scratch resistance and drop resistance. I wouldn't say the curve is cinematic esp because it has ONE speaker on the REAR, but it doesn't try to escape your pocket and I like how it fits my hand and face. More one handed improvements than the Mega. As I said the low light photos are weeeak but bright shots are good/great and it has gimmicks like 4K video, high fps and 'guided rear camera selfies'. This may sound odd but I often set it face down, there are some neat advantages to doing so. The dot count is not a problem for me but my god you can read the fonts from ten feet away, could been a tad smaller in some apps?
Note 3: To me the most unique feature is how much it packs in at this size and weight, when you factor in that it's also the only game in town for a modern stylus phone (unless you score a Galaxy Round). Camera setup is one of the best on Android, tho M8's ludricrous 5mpx front camera is a neat trick. 4K, high fps, etc on video. There are many who like the Note and especially a group who have no alternative that meets their needs (PDA generation?). Also you know...Touchwiz, but I hear they've got ROMs for that if it really bugs you.
Other thoughts, the M7 I feel fared better than the S4 and Note 3 during the 4.4 rollout, maybe I am mistaken but that is my impression. Right now my Flex seems to have zero nasty surprises but we're getting 4.4 right now. I guess within another week it will be known whether the update breaks things for us too. I mean that SD problem is a kille- wait, no SD no problem

And I have a big Dropbox share pool as a backup thanks to my Tab 3 7.0 LTE tablet.