Just go to the pages you have quoted, all of those provide exhaustive lists of available bonuses. I think all of those sites have a "beginners guide" suggesting 5 casinos to do first.
Then after that just look through the full lists which they provide and choose a bonus you like the look of. Things to take into consideration are the games allowed to clear the bonus, the expected value after clearing, the amount needed to wager, how much you plan to bet each hand, the time it will take you to meet the wagering, and one thing that is often overlooked is the chance of making profit.
You can use the calculator here
http://www.beatingbonuses.com/calc.htm to see your chance of gain and variance.