Ok, just bought Nexus S 4G...and it is VERY cheap!!
Basically, we got the family plan ($129/mo). I got Sprint to give me 6pm for free. My Iphone 4S is coming next month once i have my upgrade discount. With Sprint, anytime you order a smartphone with their data plans, you are charged $10/month ("premium data charge"). After next month, my bill will be charged with $10/month on top of the family plan cost.
My wife's line is ready for upgrade now. So, i bought the Nexus S 4G via Sprint.com. It is only $30 after rebates, blah, blah. In addition, as a bonus, i do NOT have to pay $10/mo "premium data charge" with the Nexus S!! We just saved $120 annually by going with this phone! :zoom:
Thus, after next month and my Iphone 4S, we will pay $139/mo. only instead of $149/mo!! And i will get 6 pm calling free!

All with unlimited data & texting.
Gotta love Sprint...i just hope that they won't go out of business anytime soon!