I've also heard good things about carjet, and amigoautos is also good for AGP rentals, but, assuming no big price differences, I would book directly with Record, because they're probably the only on-airport local operator that doesn't force you to prepay for your petrol at an extortionate rate (I paid Goldcar 70 Euros for a 55-litre tank when pump prices were 0.973!). However, I don't know whether they've got any automatics.