95 Le Sabre

I just bought a 95 Le Sabre and it has the radio with cassette and not cd. I was wondering if anyone has any information that would be helpful to getting a new system or reciever. I would like to change out the cd player and add some subs because this has the concert sound 2 package for speakers. Any help would be appreciated.
Thank you

http://www.crutchfield.com/S-QPC09N1XaO1/cgi-bin/autoinfo/autoinfo.asp?vehicleid=0&typeCH=home&vb=Y&lp=%2FS-QPC09N1XaO1%2Findex%2Ehtml%3Fwm%3Dtn1%26id%3D0%26v ehicleid%3D0&cm_re_o=TkB_zkEzM*kwufEzM*ctzfubflFYgzy

link to crutchfield's "what fits your car" page.

You can definately find cheaper prices elsewhere, but they do have GREAT customer service

I tried the crutchfield idea, they said they didnt measure my make of vehicle so it wouldnt tell me anything. What elese can i do?