Fly Boxes -- Advice?

I'm thinking of replacing the foam cheapies I'm currently using.

Wondering which types/brands you guys use, and why.

I've been thinking of something similar to a small Plano box with a bunch of
compartments. Keep a bunch of different flies together in one spot and that
sort of thing. The only downside to this (that I can see, anyway) is that if
you tip it over or drop it, you're in for a really bad day.

I'm pretty sure I like my current general organization -- one medium (3" x
5" (??)) box for mays, one for caddis and stone patterns, one for
streamers/nymphs, and one for bigger flies/whatever I pick up at the shop
before hitting the river. I am of course open to suggestions on this aspect,
also.

I'd like to keep the cost reasonable (mebbe 100-150 max for the whole set),
but if something costs a little more, not a major issue.

Muchas gracias,
Dan
Who had a great time troutin' during the salmon run on the PM last weekend.