We booked a 4-hour package (venue is 1 hour away) with a black stretch limo from L.A. Limousine in Wilton. They were very friendly and their prices were much less expensive than other companies we checked (Grace, Black Tie, Thomas Transportation, Adventure Limo).
They'll transport the bridal party from Nashua to our venue in Jaffrey, and then pick up the grooms party at the hotel in Keene and bring them back to the venue in Jaffrey. After the ceremony--there will be about a 30 minute ride with champagne.
Still firming up guest shuttle options, but so far, the best prices that we're getting are from Thomas Transportation (Swanzey/Keene).