Can you explain to me what you mean by NDL on boat dives? I plan on doing boat dives with the Sanctuary or the Monterey Express and would rather rent their tanks, they use Steel 90 or 95's if I can remember. MG
By NDL I mean no decompression limits. As your breathing becomes better, you might find yourself back on the boat with 15-1800psi unless you go into deco.
You *could* get two dives out of a mondo tank if you're shore diving Monterey once your SAC rate comes down. But if you're going deep at Monastery, that's another story.
Techdivinglimited has the Faber 120's on sale for $250.
TFH-120-DIN/K-Special 2006 Hydro [TFH-120-DIN-Special] - $249.95 : Tech Diving Limited - Home of Nautilus Dive Planner
That might be the way to go if you still want a giant tank.