Hi Dennis,
IIf you plan on just one all-rounder, that's a bit more tricky and the 8x makes good sense.....but 7x has seduced me, so my first choice would be the 7x42.....you really lose nothing in magnification, you gain more f.o.v. (& depth of field) & shake is far less apparent when viewing. Low light performance may also be a tad better?
The 7x42BN Trinovids are getting scarce (new & used) and will hold their value well.......
I agree entirely with Mook's recommendation. Interestingly, I had a crisis of conscience a few years back that my Leica 7 x 42 BA was redundant of a newly acquired Zeiss 7 x 42 Classic, and consequently I tried to sell the Leica for $625 on both eBay and Astromart. Remarkably, there were no takers and no interest. I ended up holding on to both the Leica and the Zeiss, and, as a now confirmed 7x fan, am very glad I did.