Personally I think the best promotions is not to take any at all. When you deposit any amount without a bonus you will be able to cash out on any win. This makes it much easier to walk away with some of the online casinos money. If you loose they will bonus you anyways trying to get you to come back and purchase.

If your looking to get more play for your money, then promotions is the way to go. Normally purchase promotion will be at least a match on your purchase. The options are all good, so which ever is your personal choice you will find online casinos that will provide this.