I want the GPS 396 and the Garmin 90 fishfinder. I prefer seperate units as I want to use the GPS in my car and my motor boats. At $999 the 396 is a bit pricey, but I intend on using it in my car as well.
I would strongly suggest the Fishfinder 90 ($90) and a Garmin handheld unit ($100-$150), which still puts you under the $399 mark, and you can use the GPS in you car or whereever you may wonder (without your kayak).