Great question!
I've been through this a few times, and for me the most nerve-wracking part of the experience was the choice of woods. I am pretty picky about the appearance of the wood, especially the top, and given the killer quality of the stuff in Alembic's stash and the infinite variability of the appearance of wood, I really agonize over the choice. Some of the other choices we have to make were easy for me. I love the standard Europa body shape, and to my ears Series electronics are perfect, so at least I didn't have to sweat those details!