I'm using Fuji Crystal Archive Type 80 L (lustre) this is my second box and it's interesting to note that my first box had these filtrations:-
Reala M106 Y125
Kodak 160 NC M96 Y104
On the first box I used I was down to M50 Y15 printing from the 160 NC negatives, which was something I was uncertain about as to the correctness until I realised that the filtration so low appeared to be normal.
The second box I am currently using was bought on 04-03-06 and is nearly empty so next month I'll see what the Fuji gods have in store.
PS- PE I tried the MGIV in the bck of the F3 last weekend but stuffed the exposures with a light leak, I'll repeat in a couple of weeks.