What kind of affiliate programs would you go for?

Hi I'm new here and looking for a bit of guidance. I'm building a social networking site and I'm looking at building an affiliate program into it with financial rewards instead of extra credits/seeds/points etc...

My question to anyone here or anyone experienced in the affiliate marketing business is, what kind of programs/incentives would get you interested?

For example i know that a large number of hosting companies offer a 1 time $50-$70 commission per sale, when the hosting itself only costs $5-$10 a month. So they are willing to give up the profits for the first few months to make them more enticing.

I still haven't really settled on a payment style so recurring % of sale (residual style income) or 1 time commissions are equally doable.

I'm also toying with the idea of random paid referrals i.e- If someone finds my site organically a high level affiliate partner has a chance that when they purchase something it will go under them instead of all to me. (reward for being a higher level member)

Please give me some feedback as it will greatly help me help those of you who may be interested in some affiliate offers down the track.

Thanks