You will get all the darn options if the program you joined under later decides to end their participation in e-Rewards. So those of us who joined under Delta (or in my case, Northwest) are in luck. I've been going with IHG the past two years because, for some odd contractual quirk, they've posted as elite-qualifying. Their current airlines, car, and hotels list for USA participants:
Flying Blue
Alaska
American
Avios
British Airways
Choice hotels
Club Carlson
Aeromexico
Emirates
Ethihad
Flex Perks
Frontier
Hertz
Hilton
Hotel Club
Iberia
IHG
Jet Blue
LaQuinta
Le Club Accor
Southwest
United
US Airways
Virgin Atlantic
Virgin America
Wyndham