hmm...it's hard to say. Depending on what your coaxials are, then you might be fine just sticking with them. But components, especially higher quality ones, will get you better separation between frequencies. You will get a clearer sound and more...*fullness* to what you listen to. You really should go listen to speakers though. Make yourself a mix CD with a bunch of stuff that you listen to normally. Bring it to a shop and pop it into the HU and start comparing speakers on each song. Find the ones in the *top* (or otherwise) of your price range that you like the most and buy them, but not before you listen to some coaxials to compare as well...if you find that the coaxials you have are just fine, then stick with them.