Isn't Bunta's Impreza a 2 door? I've only seen a model kit picture.
AE86Driver: I think your best bet for an initial D garage is GT2. I think you can get pretty much everything except Itsuki's car (AE85). (from the 1st 3 stages, anyway. Haven't seen the new ones)
Here's a list I compiled a while ago:
-Toyota AE86 Sprinter Trueno GT-APEX type-II(white on top, black on bottom) (Fujiwara Takumi). GT can't simulate the engine swap, NA doesn't tune that high
-Toyota AE85 Levin (Itsuki Takeuchi) I just got a black/red Levin instead
-Subaru Impreza WRX/ ?, black, 2dr (Bunta Fujiwara)
-Nissan Silvia/ S13, white (Kouichirou Iketani)
-Nissan 180SX (240?), white (Kenji)
3 of them in GT, don't know which is closest
180SX Type S (worst power/weight ratio in a stock FR)
180SX Type X '94
180SX Type X
-Mazda RX-7 Savanna/ FC3S, white (Ryousuke Takahashi)
-Mazda RX-7/ FD3S '91, yellow (Keisuke Takahashi)
-Nissan Skyline GT-R/ R32, black (Takeshi Nakazato) I don't know of it's year or Vspecness
-Honda Civic/ EG6, red (Shingo Shouji) Si or Type R?
-Nissan Sil-80, blue (Mako Satou)
-Nissan Silvia S14, orange (Kenta Nakamura) not sure it comes in orange
-Toyota SW20, blue (some guy)
-Toyota Celica MkVI GT-4, white (some other guy)
-Mercedies something, white
-Mitsubishi Lancer Evo III, Black
-Mitsubishi Lancer Evo IV, White
+A whole lot of other Lancers
+One of the RedSuns is a MkIII Supra, caught that in a freeze frame. Probably a lot of other cars you could get like that, I just like Supras.
The only iffy one is that Mercedes. I think its the same body style as the E55 in the game, but the car in Initial D probably isn't the AMG version. Close enough, I guess.
Organic Zero
If you go to japan, there's a good chance of seing others transformations regarding other brands, and not only nissan.... stuff like:
Oneline - 180sx front + Any Skyline rear
Onevia - 180sx front + Any Silvia rear
Zeight - 240 Fairlady Z front + 180sx rear
Silline - Any Silvia Front + Any Skyline rear (the usual is a S15 with an R34)
Sopra - Soarer Front + Supra Rear
and so on.... most of the are made into drift cars and such.... imo gt4 should have had some of these.... they are really nice cars... specially the Zeight
I've seen a few Soapras, but I didn't know the whole front end swap thing was so popular. Maybe I'll just go google some of those...