I'm a Lain collector, and I counted wrong, I forgot about the cheap set that I use for actual watching, so this will be the sixth boxset I have.
I already have the limited edition artbox (signed by Ueda and ABe), metal lunchbox boxset, laser engraved Paul Champagne metal artbox, Rondo Robe Selection boxset (R2), and the previously forgotten Geneon signature series boxset. There's still several more that I eventually want to get as well.