Wait for Zerocoin to boot BTC out.
You prefer an altcoin that requires centralised trust, over a decentralised Bitcoin?

Anyhow, hopefully the Zerocash folks will be just another Bitcoin side chain.
I was under the impression Zerocoin was supposed to merged on top of bitcoin originally - I haven't read their white paper in detail though.
Originally. But the original concept was completely impractical (and still had the centralised trust issue).
Real-world utility is essential to the value and success of a crypto-currency, therefore most of the alt projects just seem like moot (especially at the stage where even bitcoin lacks wide-spread adoptation). On the other hand blanket opposition to any kind of innovation on the bitcoin blockchain seems just as counter-productive.
The idea behind side-chains is that you will be able to simply move bitcoins across multiple blockchains, with different properties of their own, and back again.
This makes them real-world usable, and free to do almost any kind of innovation.