I recently used some of Kodak's Ultramax 800 on a trip, sometimes rating it at 1600 other times shooting it at 800 all developed normally. I thought it did pretty well. The PGI is the same as Portra 800, but the cost much lower (~$3.50/roll in 4 packs 24 exp).
I also shot Kodak's HD400 rated at 800 a bit. Actually if I only needed ISO800, I shot the HD400 instead since the grain is much finer and the film has plenty of latitude for this. The grain on this consumer film is a smidge finer than the new Portra 400NC and likewise, its much cheaper (~3.50/roll in 3 packs 24exp). I shoot the new Portra 400NC in sheet film and have some in 120. Its nice stuff too.