Minox 35GT or GT-E. The smallest 35mm camera ever made. Great Minotar 35mm 2.8 lens. Aperture priority. But in light of your comment that OM-2 is too small, maybe the following is better:
Konica T3n with Hexanon 40mm 1.8, if you like big, heavy metal cameras. If more plastic but lighter weight is preferred, Konica FC-1 with the same 40mm 1.8 lens.
Leica M3, Bessa R2m, Minox 35GT, Konica C35, Yashica GSN, Minolta Hi-Matic E, Rolleiflex 3.5F, Leicaflex SL2, Nikon F, etc., etc...