Humm.. you do know that your going to need an amp for the sub? and possibly an amp for your front speakers (although, you can get by with using your cd players power for those two speakers). I'd say that your looking at more money then you figure.. if your going to get a sub, your going to need an amp to push proper power to it, power wire, speaker wire, rca's and also a box for the sub. Also, $75 for a sub is a little low, the only sub that I would recommend for a good value would be an Adire Audio Shiva, which you could get for around $115 from adireaudio.com. Front speakers, i'm not sure if your looking at just getting two speakers or a component set, with the speakers, cross overs and tweeters.. which has a wide range in price. You could probably get a decent two way set of front speakers that will run off your deck for around $100. Check out some audio forums, and read before you buy.. that is really the only advice I can give, read read read. Try elitecaraudio.com, sounddomain.com, termpro.com, caraudioforum.com etc. I made a lot of mistakes when I first got into car audio, I wish I would have read more.. but I guess the same goes for every thing, eventually you will more then likely be unhappy with your choices and decide to redo it.. I have re-done my stereo 3 times now, and after three years and thousands of dollars, I finally have something that i'm completely happy with.