I saw the one guy who told you wait for the Note 4. Honest truth, if you wait for the better thing, you'll always be waiting because the next thing might be better. Honestly, play with the Note 3, play with the G3 in store. Anything new on the Note 4, will probably be a first version Samsung "Lets see what sticks" method, but if you prefer the size and S-Pen of the Note 3, then give it a wait but understand price will also be involved.
Personal choice, I have a Nexus 5, had a ton of LG phones and got me into disliking anything LG. The Nexus 5 renewed my faith, the G3 has had all my attention since it was announced and the 3GB of ram, 32GB of memory and an SD slot make it the phone I want but can't afford because I'm unemployed. I was into the idea of the Note 3 but really, unless you're a drawer, most you can do on a phone smaller, and my hands big so the 5.5" works well for me on the G3. I told my brother of this phone, he saw it in store at best Buy, he fell in love, he is an iPhone user.