What about a black suit? Would I look too much like a funeral-goer? I always hear people say grey or navy suit, but I happen to think that a black suit looks sharp.
Would that stand out (in a bad way) amongst the sea of grey and blue?
Most of the grey that I saw on the interview trail (myself included) was a charcoal grey, or grey with thin, unobtrusive stripes. There were a few tan and light grey suits, but mostly they were dark enough to look black from a distance.
I would say black is fine. I don't personally care for how it looks, due to the funerary connotations you mentioned, but if you already have a well-fitting black suit, then wear it. As long as you're not showing up in a white linen suit with a string tie, you should be ok. Go to Macy's or Nordstrom and try them on and see how you look.
Imagine you're going to a board meeting at a Fortune 500 company, would what you're planning to wear be out of place there?
While I'm indulging myself:
Ties: please, please, please, snug your tie all the way up. That's how it's supposed to be tied. The half-undone look just looks sloppy. "It's too tight!" i hear you cry. Then learn how to tie it snugly, but not so tight as to compromise your airway. And wear a shirt that fits, that will help more than your tie will with regards to neck comfort. The top button is supposed to be fastened when you wear a tie, so buy your shirts accordingly.
I realize there are differences of opinion in men's fashion, and that a more "relaxed" look is currently popular. Bear in mind, however, that the people judging your appearance (and yes, they are) may not be as attuned to those trends and may see "relaxed" as "sloppy".
Many business people wear a suit every day of their professional lives, we are fortunate in anesthesia that such days are rare. You can tolerate a suit for a few days a month on the interview trail. Plus, you can always travel in your jeans and t-shirt.