Yup I've been thinking the same, Full version or LT.
As far as I can tell, the main advantages of the full version are more ins/outs, it also has a mic preamp, the scribble strips, and 10 stomp switches vs 8 on the LT.
What I'm really interested in is the ability to split the input signal, treat them differently and them sum them again at the output, I like to use the Billy Sheehan type of sound, where you have 2 separate signals. A clean low end signal with highs rolled off, and then a separate high frequency signal, which gets the distortions / modulation effects.
It looks like the possibilities are endless for this sort of thing in the Helix.