I'm looking at getting the Samsung galaxy s6 as they have the 32gb on sale for €489 , but there's rumours that they will release the s7 as early as January.
I'm in the same boat. Not too sure to either wait or buy it now 64 GB for $650.
I honestly not a heavy user, i have had my phone now blackberry z10 for about 3 years looking to get android (casue blackberry has their apps on android). Also, rumor has it that the sizes will be 5.2 instead of 5.1... i would prefer the smaller one but its not a huge difference.