GPS/Sonar for catfish only......

[brew1961]

Ok there is a lot of debate on here which unit is best. I was planing on purchasing a Hummingbird 997csi (http://www.catfish1.com/forums/showthread.php?t=97846) this year. Here is a specific question.
If you were only targeting catfish which sonar unit would you purchase?
Thanks in advance, Tim

[RamRod]

One that has at least 4000 watts peak to peak. It's all in what you want to spend and what kind of bells and whistles you want with it. I prefer a combo unit with GPS and sonar with a color screen for easier viewing in the daytime. But the main thing I look at is the peak to peak wattage for better detail on the bottom.