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AE Fifth Avenue is oxford (balmoral) quarter brogue and AE Sandford is derby half brogue, so formality wise Fifth Avenue is more formal than Sandford.
I found anything non oxford and beyond half brogue is a bit (just a bit) too casual to be paired with suits (That why I found AE Strand is a bit confusing, but that just me). Of course there are exception, something like plain toe Air Jordan 5 Retro derby (AE Kenilworth, for example) or plain toe blucher Air Jordan 2011 (AE Leeds or Alden PTB) could be paired with suits and casual dress.
Lake Forest is just Sanford + orthotic, no? Madison Avenue is basically a derby Fifth Avenue, so it will be quite okay with suit and casual.
In the end, pick what you love, of course. If you love Sanford, get it, it will still looks good with suit and casual and still better than any other square toe plasticky leather some people seems to love to wear them with suits ;)Get yourself a nice pair of oxfords, something in navy or tan will work and be diverse in many ways. I know I personally enjoyed using (while working there) Banana Republics oxfords, comfortable, and will last you a good while, plus right now is they are having their 40% off sales, so never hurts to bank in on that discount.
Loafers are a possibility, but depends on the level of formality and material they are made of. While wearing a suit, it has to be somethign laced up, it add that nice touch to the outfit, that is sharp and elegant. When however, you are wearing g chino and slacks, you have more possibility, I know I recently tried working slacks with some Born loafers, and loved it because of the comfort and style, so find comfort in knowing that there is possibilities in wearing more than just oxfords. With fall coming up, brown Mocc are a possibility again, so look into at least having one pair in your armada, a solid chocolate brown will get you through the Air Jordan 1s coming fall/winter season.