The Alumitechs fall into the 'sport touring' lineup. Geometry was slightly more relaxed than Miyatas high end racers. They aren't overly stiff like a big tubed Cannondale which gives them a much smoother more comfortable ride.
It'll have bonded main tubes with a chromoly rear triangle and chromoly fork. My odl Miyata ATB was an Alumitech and I beat the heck out of that thing.
What size are you looking at? 105 equipted Miyata....$250-300 for an end user.
1984 Schwinn Paramount; 1987 Schwinn Paramount; 1975 Tom Ritchey, 198X Vitus