Hey Sue,
I'm signed up with over 40 sponsors, and I add a new one at least once a month. The only hindrance you'll find is that it may take quite a while to build up enough sales to get a check with some of them, but IMO variety is key with a link list. I've got a page with some of the HFS sponsors I use that actually convert for me
HERE
The links on that page have my ref code in them, but the page is there for information as well so don't feel obligated to sign up under me

Those are the programs that do the best for me with HFS.