I'm looking to mine alternative coins since gpu mining of bitcoins is starting to slow pretty drastically for me now. Which alternative coins have decent liquidity to convert into USD or bitcoins?
I've started lite coins since there are exchanges for those, but what about feather coins and others?
Is there any value at all in the others yet? pi coins? prime coins? etc...
Honestly, your best bet if you're unsure is to mine on an automatically switching pool that mines the current most profitable coin. The two that come to mind are:
multipool.us - This one has a small set of coins (ever increasing, though) and will build up a stash of each coin that you can then sell (or hoard).
and
middlecoin - This is different because it will automatically mine the profitable coin, but then sell them, meaning you get the Bitcoin from the sale and not worry about the other coins mined.
However, if you want to mine a specific profitable coin, you can check these resources:
http://www.coinchoose.com/http://www.coinwarz.com/cryptocurrencyThose should help you decide.