dah328 is right; the question as posed is basically unanswerable. What level of formality do you need? Will you be wearing these shoes in important business meetings attended by very well-dressed men? The answers to these questions can help to choose between balmorals and bluchers, with the former more formal than the latter. The answers can also help you to decide between brogues, semi-brogues, cap-toes, or plain-toes (increasing order of formality). Once you think all of this through, you may well decide that a pair of cap-toe balmorals would be most versatile. How much do you want to spend? I didn't see anything in the original question to suggest that higher-end shoes are out of the question.
If you want a pair of stylish, medium-priced black cap-toe balmorals, I would consider a pair by Crockett & Jones purchased from PLal.http://www.plal.com/
Here you will have a choice between the regular (or "Benchgrade") line at around $325 delivered (check out the Connaught and the Bedford, and possibly the Shaftesbury, at the first link below) and the top-of-the-line Handgrade shoes at around $425 (check out the Audley, Whitehall, and Belgrave at the second link below). When you click onto the links, first maximize the picture, and then click on the page number at the bottom right-hand side of the page. This will bring on an icon with arrows. Click on that icon, and the image will be further maximized.http://www.plal.com/crockett/cj6n7.jpghttp://www.plal.com/crockett/cj2n3.jpg
To my eye, the C&J shoes are at once more elegant and more conservative (and thus ideal for business)--and just better-looking--than some of the other shoes suggested above. However, opinions will certainly vary on this! If you do decide to buy from PLal, I would think an order placed in the next few days would get to you in time for early July, but you should check this out with Shyam Doshi at PLal to be sure. Good luck in your search.