$25k is abit on the rich side especially since it is stock although it is from an importer/dealer so you may be able to talk them down afew $k.
For $25k i'd want something in absolutely mint condition, not a single mark or scratch making over 220rwkw before i'd even open both eyes at it but then again you may want a totally stock car.
Save your money and buy a '94-'96 for around $16-20k that already has a sound system, exhaust and maybe wheels etc. For example my '95 has 100,000km on it and is slightly modified and I want $19k. To take your '97 from stock form to where my '95 is (mods) would cost you a solid $8k ($25k + $8k = $33k for an R33 GTS-t = *ouch*) and it's still only pushing 190rwkw.
If I had $25k to play with i'd be looking at a '91-'93 R32 GTR or a heavily modified R33 GTS-t with all the work already done.