Just $116ish (100.80 Euro) per night? That doesn't sound like that great a value at 20000 points. You may want to consider earning, rather than redeeming, at that rate.
You may want to call up Best Western and see if that "not enough points" is enforced on over-the-phone bookings.
I did have enough points for each booking individually, so I guess that's why didn't run into that online "not enough points" issue, but they still didn't deduct my points anywhere near booking time, just shortly before the actual stays. And they allowed me to book more nights than I had points for, at least as long as they were broken up into multiple stays (no one stay needing more points than I had). I booked one stay for April and one stay for July, and didn't have enough points in my account "momentarily" for both, though I covered it fairly quickly after that.