IPhone 5s plans for StraightTalk, T-Mobile, and Virgin Mobile?

I'm going to get an unlocked iPhone 5s. However, my parents will not pay for the at&t, sprint and verizon plans. They said that they would do the straight talk, virgin mobile, or T-mobile plans because it is cheaper. I was wondering when the plans would come out for the 5s, and about how much they would be (compare it with the iPhone 4 when it came out). I really want to get this phone fast and start using it.

T-Mobile
http://www.t-mobile.com/...idual.html

Virgin Mobile
http://www.virginmobileusa.com/cell-phone-plans/

Straight Talk
http://www.straighttalkbyop.com

Could be six months to a year before the new iPhones filter down to the MVNOs like Straight Talk and Virgin/Boost, although T-Mobile has them now.