The front doors will take 5.25" speakers (as will the rear doors). I would place tweeters in the rear deck for the best sound separation, and be very careful of how you set them up. Just throwing a pair of speakers into a configuration can ruin an otherwise good sound system.
I would definitely recommend you DO NOT place your tweeters in front of you. It will most likely give you a raw, possibly painful sound.

On head choice, My picks would be Bose, Boston, or Blaupunkt, but the most baseline I would choose would be Alpine, Pioneer, or Panasonic. Rockford Fosgate could be nice, but I've never heard a complete system setup with only RF equipment.

Also, a subwoofer should be the last thing you purchase. Last as in after you get new speakers all around, then a receiver and amp for the speakers, then perhaps tweeters, and last and least importantly, a subwoofer.
Since you have the space in the wagon, you might consider putting in full size component speakers in the rear. There's room, and you could bolt them to the floor, where they could sit without them looking trashy (rather than behind the headrests. The rear deck would give for nice sound penetration of the woofers, good high/tweet reflection off the glass, but you should probably keep the mids in the read doors.

I would like to see someone put some 6x9"s 3-ways in the kick panels. It would probably rattle like crazy though.


Ultimately, the stereo system is for you, so don't be hasty in deciding. Listen to as many setups as possible, and at low volumes as well as high. You're not always going to drive around with the windows down blaring music, and some setups just don't sound good at low volume.

-Will

It depends on what year your car is. I have no complaints about the sound from the stock Electrolux speakers in my 88 745. The ones in an 89 I used to own were fine when I first got it, but they gradually deteriorated over the years and I had to replace them, so I suspect the amount of use (and the volume they are played at) has something to do with it.

Every 740 I've ever seen has speakers in the front doors, wagons have them in the rear doors, and sedans in the back shelf. Never seen dash mounted speakers--as far as I can tell, there is nowhere to put them, or do you have a 91-92 with the new style dash, and if so does it have speaker holes? If it does, that's probably where to put the tweeters, and use the front doors for the main bass/midranges.

I agree wirh Ryan R's negative comments about Sony. At present I have a 10 year old Blaupunkt in mine, which I like the look of, the ease of use, and the sound quality, but it is starting to show its age, mainly by skipping, sometimes on CDs with no visible flaws whatsoever. I had a Pioneer in my 89---great sound but annoying control layout, at least it didn't have that irritating beep.