Are you talking about getting OpenBook on a single stock at one time, or the entire OpenBook feed for every stock at once, or something in between (e.g. a limit of 200 symbols)?
$5k/month wouldn't be bad for the entire feed (but how would you receive it without a high-bandwidth fibre service or colo, which I think Genesis can provide, as well?).
On the other hand, $5k would seem steep to me for a single stock at a time; there must be cheaper alternatives for this, e.g. RealTick Pro.