JJ, I am going to go with the same HU as 4MLA1FN is..the Alpine 7995. If you don't like Alpine check another company, but go with one that is silver faced to match the interior trim of the STi.
I own the Alpine 7994 in our 4Runner and it is awesome! It is a single DIN, MP3, CD with the works..XM, etc. With the MP3 discs you can hit "random" and have 10 hours of music just shuffling (at around 128K MP3s). If you're looking for more music capability go with a matching Alpine CD changer (but go with the one that has MP3 compatible CDR/CDRWs. I think that is another $230 from Cruthfield (for example). This way you would have up to 7 discs of music whether they are MP3 or regular CDs.
If you want the 6 disc with cassette stick with the OEM unit. <--which I wouldn't. As far as double din, get that if you want, otherwise get a nice install with nice install kit, or go with the Sparco car and have your gauges mounted underneath.
I own the Alpine 7994 in our 4Runner and it is awesome! It is a single DIN, MP3, CD with the works..XM, etc. With the MP3 discs you can hit "random" and have 10 hours of music just shuffling (at around 128K MP3s). If you're looking for more music capability go with a matching Alpine CD changer (but go with the one that has MP3 compatible CDR/CDRWs. I think that is another $230 from Cruthfield (for example). This way you would have up to 7 discs of music whether they are MP3 or regular CDs.
If you want the 6 disc with cassette stick with the OEM unit. <--which I wouldn't. As far as double din, get that if you want, otherwise get a nice install with nice install kit, or go with the Sparco car and have your gauges mounted underneath.