Check out the video slots at online casinos that run Microgaming software.

I think that the best Microgaming online casino is Casino Grand Bay: http://www.referspot.com/showadtext.asp?g=0&b=1456&w=1649&s=b

I have been playing there for some time, and am confident that their games are on the level. Also, the customer service folks are very helpful when I have questions about deposits, withdrawals, and bonuses. You can play in Practice mode at Casino Grand Bay as well.

If you like the slots at Casino Grand Bay but want to try a different casino (maybe to get all the initial signup bonuses!!!), GaminGoogle has a list of over 50 Microgaming Casinos that offer at least a 100% initial signup bonus: http://robertmedl.com/gamingooglesearch.php?as_idp=100&t=Casino&as_sof=1

Best of luck!
Robert