I finally bit the bullet and replaced the original radio. I bought a Kenwood KMR-D382BT Marine Radio.
Installation was very easy since I have a base roadster. Crutchfield provided a wiring harness adapter, so it was pretty much plug & play.
I should have heeded pizzaguy's words and done this a while ago! It sounds so much better and louder. I was also able to match the color of the display with the dash lights.