What did you not like about the M8 or was it just faulty? I have the G2 and I'm due an upgrade in a few months, so I'm torn between the G3, M8 or the Note 4
I can't really fault the M8, it just didn't live up to my expectations. As I've stated too many times to count, the camera is not bad, but it's not good either. I'd rank it in the middle of the competition, which is fine, but when you purchase a new "Top of the Line" phone, you want
everything to be the best, right? After my camera quite working, I was like, crap. Now I'm going to have to begin the process of swapping out refurbished phones until I can find one that works. That's not the M8's fault. That's the VZW's policy fault.
I'm also not the one to talk to about anything Samsung related. I do not purchase anything made by Samsung. I've heard good things about the Note line. I'm sure that the Note 4 will be a great device as well as the new Galaxy 5.5 or 6. Whatever they are going to call it. I've just never had any luck with a Samsung product.
My advice is to go into the store, hold all the phones. Play with all of the phones, and make a decision that best suits your needs. I am off of buying the G3 on launch day, unless I actually put my hands on it and cannot put it down. The M8 is the first phone I've purchased in a long time without actually picking up the device. Had I, I would not have bought one.
Good Luck!!!!!!