I have a Mongoose Rx 10.9 polished titanium road bike I bought used in 2000, so it was made sometime in the 90's. It was, and still is, a sweet riding bike. I have put thousands of miles on it and it's as good today (even after a crash that nearly killed me) as it was when I bought it. The frame was made by Sandvik, and while it wasn't as finely tuned as the better Lightspeeds, it is still very nice. The welds are top notch. Too bad Mongoose took the road they did.
Here's a link to a post with some pics that show the fit and finish of a Mongoose titanium mountain bike frame of the same era. Just something I found on the web, but I think you'll see what I mean. The polished frames looked even nicer than this one:
http://www.retrobike.co.uk/forum/viewtopic.php?t=132682