When to buy a new boat?

[Incubus]

This brings up a good question. Right now I have a type VIIC and I really like it- every few months those propellerheads in deuchland invent a new little toy for my sub (most recent is radar detector and ladder pattern torpedoes). Thus, my sub gets a little bit better each patrol. I am considering getting a type XXI when it becomes available, though, simply for the torpedo loadout.