Trying to be unbiased.

Can't go wrong with BTC and LTC (chose LTC on the poll).
Dogecoin has this huge community backing it. For what was supposed to be a joke, it has become an actual presence in the market. Price will probably rise a bit in the near future.
PPC, WDC, PTS, and MEC look to be well off.
Alternatively, you can look into the coins that are making innovations and are doing something different (MMC, DTC, NMC, NXT, ...).

But honestly, who knows where any of this will go? Guess that's the fun in speculation