I dont yet know the 5S-FE
pr 5S-FTE very well, so i'm not too sure what it's missing in his *kit*.
Although this is what he has NOT mentioned
Fuel Pump (i'm not sure how good the toyota stocker's are)
FPS (once again, this might not be a toyota issue)
BOV (duh)
Injector Resistor Pack (once again, might not be a toyota thing)
Wastegate Solenoid
Manual Boost Controller
FPR, if you go with the aftermarket fuel pump
I would suggest a new knock sensor (very imporant on a FI setup)
Oil Filter cooler - recommended
Coolant cross-pipe (i'm not sure if that's part of the water lines in the kit)
IC and piping (which you mentioned earlier)
Now, before you go out and fill your shopping list, realise that I'm not yet familiar with this conversion, and that this is a general reply (mainly based on the DSM NA -> FI i've done)
Hopefully a few of the 5S-FTE guys will see this thread and give you more insight on the subject.
As for price??? Well, what's in the kit is a good start, but is far from a complete bolt-on kit.