I'm thinking of putting some ergos on an old steel frame, and I was wondering what the differences are between these early 90's groups... looks like I could get a record group for a couple hundred bucks more than the chorus. Is the chorus just heavier but mechanically as decent? I'm not so worried about saving a few grams.

The early Ergo shifters were shared by both groups, so no difference there. A few grams of weight all around on the other components, the 'hidden' fifth crank arm on the Record if you like the aesthetics, sunken spoke holes on the Record hubs, but as far as noticeable differences in use, I doubt you'd feel any. The Chorus "functions" just as well.

Later resale, if that's a factor? The Record, being the highest level group, will probably continue to command a premium over the others, and the differential will probably grow over time. Just my opinion.

The differences in performance are not really noticeable IMO. Chorus stuff works great and the Ergos and derailleurs have identical mechanical makeup to Record. The differences are in the use of lighter/stiffer bits for the internals. And of course the finish is different - only Record gets polished on the inside of crank arms, etc.

Chorus and Record are going to be very similar, with maybe some cosmetic differences.
They both use the same spline patterns for hubs (which was different than Daytona/Centaur and lower groups),
I believe that the internals for the ergo shifters was the same.

Marty

As far as some components go (like RD, rear hub, ergos, seat post) it is extremely hard to even tell apart the Record (generation after the Corsa Record -aka C-Record) from the Chorus (second generation) c. 1992-4. Later, Campy got smarter and started scripting component group names on some of those bits. There is a sizable jump in quality from Record and Chorus to Athena (the next contemporary group), but for some parts (like front hubs or seat posts) Athena is close to the other 2. I would suggest going with Chorus, unless you have a bin of Record bits sitting. Record brakes are better both aesthetically and functionally.

hm so does that mean this is a Chorus crank? the seller thinks its record (it's in pretty bad shape anyway)..

If the gruppo is 1993, then that crank is Chorus. Looks like a Chorus monoplaner caliper next to the crank too.