We just did Alton Ha this may, we booked through belizecitytour.com and saved over thirty five dollars a person. Check it out, ask for Captain Sanchez. The van was a bit older but Captain gave us one of the best tours of the ruins you could ask for.
hkolln I would recommend the Altun Ha tour, it is better because it has more information and more temples to see. But the big plus is that it is not far from the city and you will have more time to shop when u get back. I am a tour guide here in Belize city. If you need more info please feel free to contact me at firstname.lastname@example.org.