hands down, alpine type-s 6.5 components.
installed in my '98 in about 20 min each side(mostly taking the door panel off). They sound great and i don't have them amped. I think the biggest modification i had to do was take the cover off the alpine tweeters and stick them behind the 4runner tweeter covers so they got 'stuck' in a good position. Very easy stuff.
best part, they won't break the bank, i think $119 for a set(2 speakers and 2 tweeters).