Ethereum and Monero would be my vote. I hold a small amount of each, so I'm biased but then again why wouldn't I hold what I recommend?

Ethereum: Sure, it's possible to incorporate smart contracts and other features on top of bitcoin via counterparty and the like. However, since ETH has such a smaller user base and very centralized development process, speed of development will be much quicker over the next 1-2 years while it matures. Anything more than 1-2 years out is too far, but I think that is a reasonable time frame to look at.

Monero: Similar to the above, Monero has a very targeted approach to privacy, fungibility and secrecy. It does a good job of covering all needs whether that of dark/grey markets or that of a law abiding storefronts since transactions can easily be revealed with view keys. I don't see Bitcoin gaining these features in any sort of useable fashion for at least 2 years since they'd need to be built into a sidechain first. Sidechains won't be fully trusted until the federated model can be removed and this may take even longer than 2 years, although I rather hope that it won't take this long.