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I have had this phone since July last year. I was in a similar position like yourself back then. At that time I was deciding between S4 or 1+1, but I think 1+1 was invite only then. So I went ahead with S4. Couldnt be more happier. Screen is amazing, decent battery life (around 11-12 hours on medium usage). AND if you root the phone then you can obviously get the latest Android via Cyanogen etc...
I actually just bought this to make my S4 go even futher http://www.amazon.com/warranty-ZeroLemon-Compatible-International-Guarantee/dp/B00CXZHXTG/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1430349616&sr=1-2-catcorr&keywords=GALAXY+S4+BATTERY+ZERO+LEMON
dude the batteries degrade overtime, shit happens to everyone using lithium-ion batteries
http://www.amazon.ca/warranty-ZeroLemon-Compatible-International-Guarantee/dp/B00CXZHXTG
http://www.amazon.ca/7800mAh-Extended-T-Mobile-Cellular-MetroPCS/dp/B00GNQ10VS
Oh, but there is! I have the 2x Zerolemon 3000 maH /w charger coming in for 25 or 30 bucks. No more daily charges for me!!