Another vote for the Aqua Clear. I've had Whispers in the past and there is no comparison. AC's are better filters in my opinion, much more versatile, and I think quieter. Mine are even less noisy than my Emeror 400's. I believe this is due to the impeller on the Emperors. I have 10 AC's in various sizes running on 5 different tanks. Most are pushing 10 years old. Very durable filters.
The only time I ever had an overflow onto the floor was with an AC 300 I ran on a 29 gallon feeder goldfish tank. It was my fault. I hadn't done any maintenance on the filter for 3 months. It was filthy and my fault 10 gallons of water got on my carpet, not the unit.
Barring laziness and human error, AC's should never give you any problems. I highly recommend them.