I think a good strategy Sally is to build up and keep a fairly high amount of StemDollars in addition to your SteemPower. I know SteemPower gives you influence and ups your voting power, but SteemDollars give you fluidity. And it's really fun to be able to do things with your money sometimes, even your crypto currency.
I'm not talking about a lot but having 10-20 SteemDollars always available isn't a huge target for a hacker but can be a significant value to move across to Bittrex when there's the next crazy pump.
It's all free money for me, so I'm happy to power it up :-)