Yeah you can take it that they're more expensive than a normal altezza, there was only 100 made so they're quite rare! How reliable are they? How long is a piece of string? If taken care of they're shouldnt be any problems with it, if you're out throwing it around round abouts and doing alot of drifting etc obviously a lot of work will be needed to keep her going but that'll be your own doing!
I've had my N/A one since Jan 08 and the only problems I've had so far are
General Servicing & maintenance (tyres etc) - needed in anything
Water pump & Timing Belt - when I was getting a service done the mechanic noticed a leak in the pump, not major but slight, just got it repaired anyway!
Shocks - rear passanger side shock shat itself so replaced the whole lot with coilovers. Its a 7 year old car so its to be expected though.
As long as you look after the car they're shouldnt be any problems. Its a toyota at the end of the day, they're pretty much bulletproof once looked after