I went to Swillington SS in the autumn to look at their bino selection. I had similar criteria to you ; value, as good as I could afford. I went right on the edge of darkness and tried leopold, bushnell, Steiner, Kahles.
The Kahles won hands down in the dying moments of light and the 8x42's have good field of view, excellent build quality and clarity from edge to edge. The Steiner had build quality issues - I was on the look out for them though following a previous viewing in another retailer. The bushnell were ok, clear and apparent value for money however they did not feel as good inthe hand and failed as darkness developed. The Leopold were fine. just fine, not a lot to write up or put down.
I have seen the Kahles on offer in a number of places (can't quite remember what price they were but £550 is probably not too far off).
I don't foresee them having to be replaced for many years to come.
DC