I voted for the Undisputed Championship,
while I loved the Winged-Eagle and Attitude era belts, I think the Undisputed belt would fit with the WWE better, here's why
1. Winged Eagle: the WWE already brought the retro IC belt back, I do not want the same storyline to just get copied.
2. Attitude Era: Rock is "back", Austin might do one more match, Jericho could be 1.2.12, Undertaker will do Mania, Kane is on his way back, Christian will be returning, HHH is around, Henry is WHC, etc...
my fear is, if this belt returns, with all the guys from the era still around, they'll get pushed at the expense of Sheamus, Del Rio, Punk, Ziggler, etc...and that doesn't help anyone. These guys need to start going over the "regular" talent, because, by Mania 30, most of those guys will be retired, or once a year attractions, the guys in the trenches going at it every night will be the the current young midcarders/"recent" champions (Del Rio, Sheamus, Ziggler)
This risk makes the attitude belt a bad idea.
3. New Design.
I just don't trust the WWE to make something appealing after staying with the spinner for so long.
4. Undisputed belt
By process of elimination, this is the belt that's left.
From 02 (HHH) to 05 (Cena) this belt was held by
Brock Lesnar (MMA)
Biker Taker (character overhaul)
Hulk Hogan, Kurt Angle (TNA)
Big Show, HHH, Rock (part timers who [hopefully] will stay out of the world title picture except to lose big title matches like HBK from 03 on)
Eddie Guerrero (deceased)
In short, this title doesn't have much history with the current roster outside of Big Show and HHH. And at this stage, Big Show isn't touching a world title unless he gets one last nostalgia run to put over the next big man. Rock might get one last reign if his ego demands it, but honestly, the only way that happens is if his next movie is a WWE Film and part of his filming contract is he works Raw every Monday and PPV's on needed Sundays.
HHH...he might get the title one last time just (hopefully) for the sake of putting someone over big time. If HHH were to win the title from Punk at....whatever the May PPV is in a triple threat match with Cena (and have Cena take the fall)...and hold it til SummerSlam beating Cena in June and July...they could return the King of the Ring in 2012, have the 2012 King (possibly Ziggler) get major buildup and have Ziggler beat HHH at SummerSlam 2012, instantly making Ziggler credible as a champion.
Long story short: this belt could be used to become the "face" of the "reality era"