plug in namecoin diffuclty into the bitcoin mining calculator to see the namecoins per day then check bitparking exchange to see prices. i think namecoins have potential.
http://tvori.info/bitcoin/charts/ works when charts are working. setting up namecoins mining isnt that bad. i have walked people through it for windows for a bitcoin, theres a gui interface to eliminate typing commands. Namecoins have dropped in price last few days but i think when markets stabalize they will go up. they had a huge diff jump, plus they are "used" up to register domain names. also they take less coins to register as the blocks go on. So the potential is there for increased price. also this thread
http://forum.bitcoin.org/index.php?topic=20142.0 pm if you need any help
gl and happy mining