I could use some help (or advice)

I'm getting married in a short while and am putting together my choices on clothing. It's not going to be a strictly formal event, but I will be wearing a suit and tie for sure.

I've decided on the Indochino Ultimate Gray Suit (or a very close variation of it)

I've also selected Allen Edmonds shoes, I'm caught betwen a couple of options that will dictate the rest of my outfit.

If I go with the Mcallister I think I will go with the Walnut Calf:

But if I go with the strand I will go with the Black:

Now my main problem is that I prefer the Walnut Calf to the black by far, but I understand how to dress around a black shoe far better than a brown.

So my main question is, would the walnut be appropriate with a gray suit for my wedding (keeping in mind that it's not a very formal event)?

Also, would the tie I am thinking of work with a brown shoe? If not, does anyone have suggestions for a replacement (the wedding colors are sage green and cream, but I have no interest in matching)?

And finally (as if this all wasn't enough) if I decide to go with a brown shoe and belt, is a black watch still alright or does all leather ever have to match?

Thanks for any help you can offer.

I should add that I plan on wearing just a white dress shirt, nothing special.

I can respect that, the Park Avenues are beautiful shoes. What is it (in your opinion) that sets those apart for a wedding day from the other two? (I also take it this is a suggestion for black shoes over brown)?

It's going to be an early fall wedding (sept 15) and an outside ceremony/inside reception. I'm putting together an outfit specifically for this occasion but have every intention of reusing the individual parts afterwards. So yeah you're kind of right, it's a nice excuse for me to drop over $1000 on clothing that I would normally not be able to justify.

I think a full on morning coat might be extremely out of place for this event, a tad bit over the top.

I am starting to come around on the Park Avenues though, they are a really classic shoe and might be a good addition over the more elaborate Mcallister or Strand.

I worry that going with a shade of green will give the apperance that I'm trying to match the bridesmaids dresses. I certainly don't want to do the painful everybody wears the exact same color, but I know given my choice of suit and shoe color a green or blue tie would be the easiest match.

As for the watch, I hadn't thought of it in that way. Wearing a watch has just become a habit, I may need to put more thought into that (especially since I planned to give my groomsmen pocket watches as a gift).

Currently researching Macclesfield ties in more depth to figure out exactly what they are and how to best select one.

Thrown for a loop with the whole watch thing.