When comparing radios for power output, compare the RMS wattage ratings and
not the MAX ratings, some mfg's tend to inflate and push their MAX ratings
in product labeling, but RMS is what you need to pay attention to.
If you listen to the radio alot, make sure you look at the tuner's FM
sensitivity as an indication of tuner performance. The smaller the number
the more sensitive the tuner is and can pick up weaker stations.
I personally run two external amplifiers so I didn't buy a head unit for the
power it can put out, but rather for the features (mostly the built in
equalizers and crossovers, and the mp3/wma capability). I'm using an Alpine
9815, which actually has Alpine's internal V-Drive amplifier that puts out
27w RMS and 60w MAX, supposedly it's pretty good. I'd stay away from the
consumer brands such as panasonic, aiwa, jvc, kenwood, and probably sony
too. Eclipse, Alpine and Rockford Fosgate are ones I'd recommend.
etronics.com had the best price on the Alpine I bought.
Good luck
-T