depends on you mate, financially its worth a lot more than the iroc, and in every respect in terms of driving its going to have it thoroughly beaten, accelerating, braking and handling will all be considerably superior. its also going to be more reliable, far higher quality, infinitely better built, and no more expensive to run.
but its such a completely different car, its simply comes down to liking the car. At the end of the day, if its a decent one and you dont like it, you can always sell it on. With the best part of 10k in your grubbies, you can easily buy another iroc, and have change.