beginner sound system questions, would appreciate any feedback Options

[jds7188]

hey guys im i beginner to the whole celica car scene, being that i'm only 16 and just got the car not too long ago. but i have been highly interested in import cars for 3 years now.when i bought the car, the front speakers were mostly blown so im thinking of replacing them. at first, i was thinking of getting components but realized i dont have the $ right at this time. i started looking at some 6 1/2 pioneer TS-A1680R 4-ways 2-50w rms. i dont like brain busting bass, but like to hear some decent bass every once and a while. i dont realy want to take up any trunk room so im not thinking of subs right now. so i have a few questions:
1) has anyone heard anything good/bad about the pioneer tsa's above
2)should i buy 2 pairs, since they are only $70 a pair at sounddomain.com, and later buy a 4 ch. amp to get the decent bass im looking for once in a while
3)should i buy one set of the 4-ways speakers to get the highs and a pair of components to reach the mids and lows
- and if i did this could i set up an amp to power all 4 speakers if it were a 50w rms amp?

id appreciate any info possible.thanks for checkin this out and hope to hear ur replys.