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If you are looking for the best AOSP experience without losing all of your Samsung features like multi-window and carrier-specific stuff like WiFi-calling, check out DanDroid ROM.
Based on latest firmware for the carrier you need (e.g. T-Mobile version is based on T-Mobile firmware), DanDroid ROM is an Android 4.1.2 TouchWiz ROM that gives you the least amount of bloatware while giving you as much AOSP as possible.
Inside you will find a TouchWiz launcher that has been modified to look more AOSP along with AOSP apps like the calendar, dialer, and more. (You also have option of flashing additional add-ons.)
Overall, this is a very stable ROM that will give you as much AOSP experience without actually running AOSP ROMs. If you are looking for such a custom ROM, definitely give this one a try this week(end) and do let me know what you think!