i have gone 5 times already and i keep trying to reason why the 6+ is not worth it , but this time i went and messed around with it, i realized its the one i want , its more interesting than this 6 i have , and so what if i have to wait a month , its worth it imo lol
Since you came to that realization, then just return the 6 immediately.
I suggest you not order from the Apple online store and just check the stock online for in-store pickup. Apple stores receive new batches depending on the day and the night, so you will most likely be able to snipe one and get a device faster than if you were to order online and wait 3-4 weeks.
Theres also the option of ordering not direct from the Apple store, based on what I've seen, the prices of the phones have gotten past the "ridiculous scalper price" phase and are more reasonable than before.