First of all, try and get a better wireless plan if possible - many consumers with high end phones are using them with a larger data allowance and understandably so.
Secondly, just realize that what you're describing is extremely situational.
Samsung ditched MicroSD for very good reasons. If it doesn't gel with you, then by all means go with something else. That's the beauty of Android. But realize that the vast majority of users have found other solutions, and you should do your best to accommodate, as that's where the market is headed. Broadening your horizons will only help you out in the long run. Think critically about your usage habits. Do you really NEED all of your music with you ALL the time? Can you not be hooked up to Wifi a majority of the time? How many apps are you using on a regular basis?