Matt,
Going by much of the criteria you list there I think you would find the Original 45 fits the bill well.
Its trigger feel I'm sure ticks the box albeit the blade itself is a steel pressing. It can be adjusted to suit, and the stock is low and ambi. I suspect you would get along with either calibre though .177 in my.opinion just pinches things.
Do a little research on here on them and some others such as the Anschutz 335?
Dave