hey bro im contemplating the same thing right now. The only thing pushing me twords the gt-8 is the fact that that it has a 1/4" out that goes into your amp and will switch channels right from the board. i dont think the pod xt live has that.
Ps how do you like that weeping demon wah??
Jackson Dxmg w/dimarzios up n down
Jackson DK2t
Carvin DC127
ValveKing 100 head
5150 head
Recto-Verb 112
1960a Marshal 4x12
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weeping demon is ok... i find i dont use it very much though :S

so thats really the only difference? the channel switcher?