We've been renting from ACE the last many years because they are the cheapest for our needs. Just be aware, they tax on 25% "tax" so their weekly quoted rates aren't quite as low as they initially appear, but still reasonable. Overall, we're paying $293 for 26 days, or a bit over $11/day for a Hyundai I10, declining all insurance.

I also watch the rates, as they historically have declined the closer to travel date we get. Not really a whole heck of a lot to reduce these rates from, though.