Hi Tony -
You are a 'customer' too, whether you are looking for a commercial product/service or as a consumer. Take a look at the sites of companies that you may deal with and write a list of the things that you like about them, and a list of things that you don't. Also take a look at your competitior's sites and do the same.
When you go to your designer take this list, and a list of sites that you like and give them to them.
Go to a web designer who has a graphic designer on board (in house or out sourced) as well as a web developer as they are not the same thing!
Ensure your web developer has a grasp of search engine friendly website development.
If your budget allows (or if you are a professional copywriter), ensure the copy is written professionally by a copywriter who has an understanding of writing for the web as we digest information differently on screen than in print.
I have more info on my website if it is of interest, there are a number of articles that may or may not help:
www.crystalclearonline.co.uk.
Also, check out your local business link or whoever you have in your locality, as they put on talks for small businesses. I do one over here in Chester for the Chester Enterprise Agency and I get really good feedback from people as it gives them an insite before they spend out their hard earned cash!
Hope that helps!