Need Advice on Vr-4 purchase

I currently own a mint condition 97' 3000gt sl that has been modified some....... I am currently looking to purchase a vr-4 because to be honest.......the sl's performance on acceleration is shit......i tired of havin a modified civic pull up to me at a light and beat me......not spose to happen.....anyways i was wanderin what is a good price for a 97 or 98 vr-4...... one that is in great condition and 50000 + miles?