There's a lot of good brands. My best advice is to ask around here before you make any decisions. Me personally, only thing I would keep from your current system is the head unit. I'm not trying to diss because Accords are great and my next car will be a newer Accord, but since your car is a 99 I know you don't wanna go spending thousands on a system. You can sell your stuff, then use that money towards another build. I really can't give you an estimation of how much your system is worth without seeing pics. If you wanna send some pics to me and a few other members around here that would be willing to give you a good estimate on how much you should ask for, please do so. There's a lot of us around that like to help people out.