first off, good luck in your search.
figure out what you want, and hold out for it.
i waited quite a while to get mine.
second, is the sport version you guys are talking about kind of like the altezza z edition (which is what i have)?
if so, i personally agree with the above posts about the lower ride and LSD...
you never know, you may want the LE, I am sure some of those came with LSD, and coil overs are much better than the stock springs anyway,
even if they are lowered... so if you can find a bargain on the LE, see if it has LSD, and save up for some coil overs.
Third, count yourself lucky, Altezza's are still hard to get over here for less than 500000 Yen (about $5500.00 U.S.).
Up to 1000000 Yen (about $11000.00 U.S.) for decent, and more if you want a Gita or super clean.
I got very lucky, 100,000k maintenance was coming due, JCI was coming due, and the car had been on the back of the lot for at least 2 years.
And I paid cash, so the guy hooked me up, and knocked quite a bit off of the sticker.
What are those prices in pounds equal to in $ U.S.?
Good luck in your search man, I would also advise you have a friend look at the car with you,
it helps when they start pointing out all the deficiencies you might not see, may also help you bargain with the seller.