It changes by the minute so reload often. You'll find that Bitcoin is almost always in the top five, while other coins will be number 1 for 2 hours and then be number 23. I'm talking SHA-256 because I wouldn't by any scrypt mining equipment right now because the scrypt ASICs are coming in a few months.

http://www.coinwarz.com/cryptocurrency

Yes, I know there are some scrypt ASICs out now (Gridseed) but I've heard they are a bit dodgy, needing frequent restarts and such. Granted this is just word of mouth and may not be factual.