I'm finally about to bite the bullet and pony up the sach for a complete set of Led Zeppelin. Best I can tell, there are 3 options, buy each CD individuall, buy the 2 box sets, or get the complete studio recordings box. Anybody who own them have thoughts on which to go with? Box sets are about $20 cheaper, but the packaginc on complete is cooler, as is the album art replication. What about sound quality?