At first I used MrLister for my ads and used online sites for photos. The other services I used were constantly "out of service" for one reason or another. Nothing hurts an auction like not having your pictures show up.
I have used Auction Hawk for my pictures for years. Any difficulties have been promptly corrected with or without my request. Last year I switched all my eBay Store and Auction work to AuctionHawk and have been very pleased with the service. Any questions are promptly answered, even my dumb ones.
This site does not have all the bells and whistles I don't need anyway and so have kept there prices very reasonable. I love the flat rates. I hate surprises on my budget.