Seriously considering getting a lifetime sub at the moment, although also looking at subscribing just long enough to get the 1000 day veterans rewards (I'm on 770 at the moment).
Personally I really enjoying the game at the moment.
Of course if you get the lifetime you get the vet rewards as soon as they come out. And I heard they might be considering doing more vet rewards.
Besides after a year your lifetime is paid off, maybe sooner if you keep subtracting $5 every month from the stipend you get so then you get all the sub perks without having to pay every month and free zen every month.