I've had my first HD for about 2 months now. My bikes older but speaker went out and I decided what the hell and upgraded through Dragonfly Concepts, Stage 3 stereo upgrade with 2 channel amp for $1,500 bucks. I'm am happy with it and blows doors off my 2000 set up (with cassette player).. Having said that, the audio upgrade thing will drive you nuts because so many opinions and everyone talks in audio shorthand, so as a novice it's hard to comprehend. Many pepole on here have been helped by membe sloride, but apparently he's on sabbatical somewhere. IMO, if it's the head unit that is the problem and you could get back to "as new" with a $250 repair, I would go that route and save your monster audio dreams until your feeling more flush and have the guidance or help to make good decisions. If you buy a new head unit, your going to want to make sure it's plug and play so all the handle bar controls work, (for instance on early HD models like mine, Aquatic AV, is a popular one) otherwise your just adding to problems and expense. IMO either go big with quality upgrade or try and fix what you have.. the middle ground probably will leave you in happy. My opinion bro (and go to audio forum discussion for a lot more).