The OP might also consider the predecessor of M: the K series. K series inherit a lot from their takumar "parents", some are even completely identical apart from the mount. M series were mostly complete redesigns trying to reduce size, weight and... price.
M series feature a number of gems (M 2/85, might be compared to FA 77) and excellent lenses (M 4/20, M 3.5/28, M 3.5/135 come to mind). So does the K series with gems (K 2.5/135) and excellent lenses (K 3.5/28, K 3.5/35). (subjective examples)
So to choose from K- M- or A series might well be a matter of the particular focal length envisioned, leading to consider far more criteria than just the "A" setting or the market price.
Last edited by danielausparis; 07-18-2010 at 04:52 AM.