No, not recommended, look at the iPhone 4 3 years out...plays iOS 7 (beta) like a cripple from what I've read.
The 4S, which will be 2 product cycles (years) out this week, while it does iOS 7, will not do AirDrop and missing some other minor features...so, next year, iOS 8 will be worse. ...no AirDrop now, and 1-2 years from now if you want to share w/someone your pics or such via AirDrop, you
still won't be able to. (I think AirDrop will be a selling point.)
The current iPhone 5 on the other hand, is no slouch...iOS 7 beta on mine is like having a new phone again. Nothing missing (except new 5S rumored to have fingerprint sensor). If you don't want to spend the $ for the rumored 5S, the iPhone 5 will go down in price after the announcement tuesday, I'd snatch one of these up! But, iPhone 5 comes in 3 country/carrier variations, make sure you can get a model that will work where you live & travel (might not be possible):
http://www.apple.com/iphone/LTE/ (assuming this link works in CA, if not, go to the Apple store online and look for similar link...info about what countries/carriers iphone 5 w/LTE will work), If none of those will work, then, maybe the 5S would be best for you, as it will likely have a new LTE chip that may work in more countries than the current iPhone 5, but the 4S is on it's way out.