http://www.coinwarz.com/cryptocurrencyPlug in your mining specs, have the website calculate which coins are the best to mine, in near real-time format. All coins with a similar hashing algorithm should be fairly similar though. Please note though that if you are plugging a lot of hashing onto a lower power network, the difficulty could raise significantly, though I'm sure you are well familiar with this.
Thanks for this. I've bookmarked this link and I'll use this when I bought a mining hardware.