@Jerry Avis- Fuchs (real or fake) would look good, but as mentioned, not period correct and more work/$$$ due to the change in bolt pattern. I'm a fan of genuine Fuchs due to the weight thing- a 5½x15" weighs 11 pounds and change with a 6 only 1 pound heavier, as opposed to 20 or so lbs. for the same size steel wheel. I believe the cast wheels weigh in at 15-16 lbs, so while lighter than the steel wheels, not quite as good as originals. And if you're talking Performance- WEIGHT IS EVERYTHING!
1 way to change it up a little- Vintage 190 aluminum wheels- keeping the 5x205 pattern would stay (somewhat) authentic, less than $200 per wheel so not overly expensive, buying them polished would add a little bling (they do come in silver powdercoat as well, it that turns your crank), and, being aluminum, the 9 or 10 pound weight saving (per corner) will improve handling, acceleration, braking and mileage (ok, the last 1 only maybe a wee bit but it's still a benefit!).
The bottom line- do whatever the hell you want, as these are replicas and it's your car. The P purists (and anyone else who thinks their opinions matter) can kiss our collective @sses for all I care.
Hope this helps. Time to go back to bed now (that's what I get for eating so much chocolate so late!) Al
PS- Great looking Spyder! I love the Martini colors against the black- got another pic that shows it off better?