FWIW, I had some points post for my first post-July 1st rental and now when I make a new reservation or modify an existing one, here's what I see in terms of redeeming for points:

3 day Minivan rental, adding GPS ($9.99/day) requires 316 points. Adding Sirius (6.99/day) was 200 points. That is the daily pricing (so would require 600 for Sirius, 948 for GPS. You can do the conversions and see what they are worth.