Opinions on a 94 Z

[Dime]

I may be taking a look at a 94 zr-1 within the next few weeks. Sellers asking $20,500 for it. Car has just under 50,000 miles, clean carfax, and looks great.
Has some work done to it:
"The heads have been ported, polished and port matched. The cams have been indexed and a* K&N performance air filter was added. The PROM has been tuned to mid level performance by Team ZR1, http://teamzr1.com/tune.html, and the rear differential has been changed from stock 3.54 to a 3.73 rear axle ratio Also, the exhaust is a Magnaflow cat back and has a performance aluminum radiator. Dyno?d at 400 rwhp. Another important fact is that the clutch and slaves were just replaced only 1000 miles ago." Also has 19" 3pc forged Automonde.

Just wanted to know if it seems like a good deal. Also, the car has 95 louvers behind the front wheels. Is that something I should raise an eyebrow to and I should look into, or no big deal?

I am also looking into a white 1990 with less than 50,000 and a clean carfax. It's the white 1990 in the for sale section of the site. It's the white 1990 being sold by Dave Duffield; asking $14,900.
http://www.zr1netregistry.com/ZR1_sale.htm

I'm torn between the two. Given the choice which would be a better car?