Having a couple of mechs around is always a good idea.
Personally, I'm just sticking with what I have now. I bought a couple of extras of my favourite tanks (Aromamizer, Crius, Melo 2) and stocked up on nic base just in case (got enough to last me a couple of years).
Define a couple of years?

Doesn't the nic base have a best before date?
I got 10litres VG,