Factory CD, you can install, but factory Nav, well...
If you have the money and the time, you *can* install a factory navigation to a Classic Prius (it has been done), but... New you're missing about US$4000 worth of parts (for what was a US $1900 option for 2002-2003 Prius), and that's before the labor (GPS antenna lives behind *everything* in the dash, for example).
I posted links to some installation stories/parts here:
http://autos.groups.yahoo.com/group/toy ... sage/77688
(they're on the Prius_Technical_Stuff yahoogroup, and you have to be a member to view the message archives.)
For navigation, if you want it displayed on the touchscreen, about your only choice is:
http://www.coastaletech.com/nav.htm
Otherwise, there are a variety of 3rd party portable units that you could choose from...
For a classic (2001-2003) Prius, there are only 5 CD options that you can get that'll interface with the dash buttons and touch-screen controls:
The Toyota 1CD player: Part number 08601-00870, replaced by part number 08601-47801 in 2003 (Y-harness now built in, to avoid Newarkitis)
The Toyota 6CD changer: Part number 08601-00891, replaced by part number 08601-47800 in 2003 (Y-harness now built in, to avoid Newarkitis)
For both of those, you'll still need the setting kit: Part number 08695-47020 for the older CD players (comes with Y-harness), replaced by part number 08695-47800 in 2003. If you get one of the older Toyota CD player/changers, and can only get the newer setting kit, you'll need to also get the Y-cable by itself, which is part number 08695-00370.
Alternately, you could get one of Harry's Jensen CD/MP3 players
(models MP3510, MP3310, MP5010) which comes with an adapter board
which allows the Jensen units to talk to the Prius' controls. It also
has a stereo aux-in jack in the front of the unit.
http://mywebpages.comcast.net/bumpelo/front.html
All of the above CD options you could install yourself, and save
yourself some cash (re:installation). Instructions come with Harry's Jensen units, and Instructions for the Toyota options are available in the toyota-prius yahoogroup's Links > FAQs section.
For the Toyota players, I might suggest calling a few different
dealers (see some of the ones listed in the toyota-prius yahoogroup's Links > Aftermarket parts section), as some parts departments will heavily discount the parts. You could also look into a wrecked Prius at a scrapyard and see if you can get the parts you want/need there for cheaper.
There were some early reports of people adding in other CD players, but they'll need to have their own disc/play controls on the unit if you want to use them. There are also some other multi-disc changers (mounted in the center console or in the trunk/boot) that some European dealers have added to some Classic Prius that are Toyota units and seem to work with the Prius' controls...
