No recommendations, when I checked a few years ago the rates were really really high. I found it much cheaper to rent a car from PIE and drop off at the Dolphin. If you are a Costco member check Costco Travel for rental car rates.
Whoever picks you up will have to have the right to pick up at that airport, so it's probably best to look into companies based in that area rather than Orlando-based companies, who will likely only have the the right to pick up at MCO and SFB.