The McQueen boots you posted are dress boots similar to these Grenson boots but without the back lacing:
or these from the Rider Boot Company:
The Stacy Adams boots in your OP have open lacing so even though they have a similar shape they are not technically a dress boot.
You should do a forum and google search using the terms "dress boots", "oxford boots" and "balmoral boots" if you are looking for alternatives to the McQueens.
Try these threads for...
Mismatching black and brown is not something I'd do personally. I can't see how the combination you mention above wouldn't look better with brown shoes and brown belt.
I only wear black shoes or belt with white jeans when I go monochrome.
Mismatching shoes and belt might look ok with colours eg navy shoes & burgundy surcingle belt but you'd have to try it out at home first..
Any light coloured wallet thats in your pocket all the time mixing with keys and coins is going to look absolutely flogged within a couple of months. I've learned this from personal experience. Unless it's only for occasional use I'd recommend against it.
I've been looking for something similar:
As well as Fred Perry & Ben Sherman a few other British brands make sharp looking polos - Gabicci, Sunspel, Pringle, Lyle & Scott and John Smedley. The fit is always on point and the quality of the likes of John Smedley is about as good as it gets.