TTY isn't a VRS service. You might want to either change your poll options to remove that and add "I don't use VRS." Give people who aren't so into VRS a chance to reply.
I'm sure there are more VRS services out there that you missed, I think CACDHH ( http://www.cacvrs.org ) is another that you mentioned, I think they primarily serve Michigan, but VRS is available nationwide. But you already got that with your "other" option.
Anyway, sorry for nitpicking! I'm just a business major graduate and a now a marketing specialist, so seeing terrible poll options is just one of my pet peeves. Thanks!