Itr
Dude, really think this over. The ITR is car created for pure driving pleasure, ( only when driven hard ). I wouldn't worry about the engine being too abused, just make sure that everything underneath is in good condition and nothing is bent from an accident. The motor can withstand lots of stress. For the engine, just listen for a smooth idle, if it's not idleing smooth, then it may have internal damage, but most of those ITR engines are very strong and can take LOTS of hard driving, ( not abusive driving ).
I had the chance to get one when i was shopping for my Speed. It had an extensive amount of mods and slightly higher miles, along with lots of JDM goodies. I passed it up because i needed 4 doors and because it's a fuggin THEFT MAGNET. Please be aware that this car deems lots of attention from the wrong people, and theives will get it, if they want it, ( which they will want ). They will come after this car, if parked outside, in rain, sleet, snow, day or night. If you don't beleive me, log on to Honda-Tech and browse the Type-R forum, or do a search for the last year and see how many ITR's or for that matter, modded GSR's or hatchbacks were stolen.
Good luck, and Buyer Beware........