The answer is simple, if you think you will want what's in the ''prime" more then the reg s5 what's waiting another Month or so? If the s5 is good for what you want, then why wait?
T-Mobile 32GB - Rooted Wicked v5 (TWRP 22.214.171.124)
Galaxy Note 10.1 32GB 2014 Edition
Galaxy S4 (VZW MDK) sold to pay for my Note 3
Droid Bionic - Traded for Note 3
Droid X - Now a WiFi phone.