I'll post my euro box at some point today or this week, it will illustrate what afish is talking about. I have many rows of frenchies and other ties, they're just all in different sizes and weights though and arranged accordingly. Properly fishing euro requires you to be ready for many changing water conditions even hole to hole if you want to go full tilt and fish each shot to the fullest.
If I'm being completely honest I usually reach for a 3.3mm and a 2.3mm bead and fish it all day unless there is a shot I really like or something isn't working. A phenomenal source for comp related supplies (tungsten, tying junk, etc.) is Devin Olson's shop tacticalflyfisher.com. To streamline I just use his beads and they're a great price. Feel free to pm