there is a fairly large difference between an sr5 and an adm. an adm is actually a better car. sr5s are cable clutch and run a k50 transmission.
bringing sr5s into the equation is actually fairly pointless, as theyre fairly pointless to import, and thats why you dont see them hardly ever. cost of bringing them in v's what you can sell them for just dont add up.
the way i see it.
adm, stock. 1500-4000. 4k would have to have rego.
adm, 4age, crap sussy up to 6k.
adm good sussy, good wheels, ect, up to 8k
heavily modded adm, 20v/ze ect, lsd, good jap wheels 8j+ upto 11k.
j' cars start at around 7 (or did, maybe not now with the ex') but thats for something that probably shouldnt get past compliance (but they do).
max is 15. to pay 15, the car has to be the type of car that japanese buyers may pay up to 15 for.
a good price to pay for a j' car is around 11ish. with you dealing directly with the importer, and choosing the car for yourself from auction/one of their brokers, and waiting for it.
you have to expect to pay more for a car thats already landed. you can also expect to get atleast of few mods, or a really mint car, one of the other. things like lsd, coilovers, bolt on ex' with headers, billet flywheel, tuned ecu, short shift, nardi wheel, tower braces ect. sometimes you can get both if youre lucky.
also, in our market, there is really no difference between a gt/gtv/gt apex. its more down to condition/mods. kouki cars (or zenki cars with kouki exterior features) are worth a premium though.