Right now I have the factory blaupunkt cd/mp3 player hooked up in my 2000 focus. I have two line out converters and have a JL audio 300/4 amp. I'm running one JL audio 12 W3v2 in a small sealed box and it is bridged to 2 channels of the amp (forgive me if I state the obvious..I'm still learning car audio) while I still have all 4 factory 6x8 speakers running off the other two channels. Now correct me if I'm wrong, but my factory speakers are running at 2 ohms instead of 4 correct? I figure each one is getting about 37 watts of power which is about all they will handle while the sub is getting 150watts. The sub sounds fabulous and that is with the gain turned very low. Now here is where you all come in. I am going to upgrade my front and back speakers and want to know what will give me great highs and mids. The factory speakers are clearly overmatched by the sub so I need something that will fill the obvious void I have in my system. If I replace the factory speakers with new speakers will I be making a HUGE improvement or will it be slight? If I spend the cash I want to be amazed immediately and know that my money could not have been spent any better. Also something else I have thought about is the power the sub is receiving. JL lists optium juice for the sub being about 300w. Will I be able to evoke much better performance from the sub by increasing its power? What I had in mind was getting another amp and running the sub on the one amp and using the 300/4 to power the fronts and backs. Am I on the right track? I'm trying to do this thing right but I'd really like to know what is best for me to do. Also I have read a lot of threads concerning oval vs. round speakers and really can't make up my mind. I know that components are ideal but they're so dang expensive. One of the local car audio shops here says that I should get the 6x8's because they will provide the best seal. I know that there are adapter kits out to use a 6.5 etc..... all of this is making my brain hurt. HELP!!