I know I'm late to this particular party, but I just renewed my AT&T contract and got the OG for $0.00 - yes that's right free
Best Buy was having a special. Everyone else in the house is running some flavor of iPhone but I was still using my Samsung Infuse 4G. Yes I was due for an upgrade.
I did a lot of research and it came down to;
LG Optimus G Pro
HTC One still going for full contract price of $199
Optimus G Pro going for $99 contract price - very nice phone but not sure I'd get used to the size
S4 going for $199 contract price - very nice phone but had a hard time justifying it over a "free" phone
S3 going for $49 contract price at BB - was a very compelling option, but just couldn't resist giving another brand a shot