There is no such thing as highest paying program. The diversity is so big that you have to really pay attention before picking up a merchant.
Some will pay more, but will be harder to sell, some will pay less, but you can make a lot of sales. Pick up some business and think about whether you can sale it good or not. Check what the internet has to say about it and start promoting. Sign up for an affiliate network such as Linkshare, ShareASale or CJ and start browsing.
At MochaHost for example, we offer a 50% commission on all sales delivered. Now..this can be A LOT and can be less at the same time. If the person orders one year shared hosting plan you may, not get a lot, but if he/she orders a 3 year dedicated server, this might mean thousands in commission. The question is, whether you feel you can sell good.