It makes sense to switch to Litecoins when GPU mining and sell LTC for BTC
Or PowerCoin - it's still relatively new and mining should be easy; if the value goes up, you can exchange it for Bitcoins.
Are there any exchanges for PowerCoin?
The value of Chinacoin and Feathercoin rose the first week then it lost about 80-90 % of its value.
I dont think these altcoins will catch value if they are just copies of previous coins, they have to really make some good changes to the source code if they want to catch a bigger crowd.