I used priceline.com for a summer trip and didn't have any complaints.
Priceline.com didn't just book me on the flights after entering credit card #'s.. there is usually an opt-out if you are not satisfied with the flight times, etc. that priceline.com found. Generally, you can decide whether you want a morning flight, afternoon flight, and the computer will search the database for available flights at that time.
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