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I love my Edelux, it's a great light and served me very well.
But I also really like the supernova tail lights. At the moment I run the two together, but there's no built in standlight in the taillights, they rely on a supercap in the front light and the Edelux doesn't have that. Supernova E3's do, because they're designed to work together. I may just save up for a bit, get a supernova and run the edelux as the poshest part on my commuter.
Out of interest, why do you want to swap? Will prob be investing in a set of lights in the new year.