Make a list of all the photogs you love in a spread sheet. Google Docs is good for this so you can access it from different computers.
Then create a generic email on the lines of this:
Hi, I’m interested in learning more about your photography services. My wedding day is: xx/xx/xxxx at VENUE NAME can you please send me your availability and pricing?
Thanks and I look forward to hearing from you,
As the emails come in fill in your spreadsheet. Once you have ruled out anyone out of budget or not available start comparing the artistic quality of each photog.
Pick the top 5-10 and compare what you are getting for your budget. ALWAYS choose quality of photos over stuff. You are not going to want the stuff if you don’t love the photos.
Do the homework of researching reviews, bbb, google their name to see what pops up, etc. Someone on another post had a great idea of picking one image from their portfolio and asking to see a whole wedding from it. Most photogs do online proofing so if the wedding was fairly recent this shouldn’t be a problem.
Once you get it down to the top 3 or 4 then contact them again to set up a skype meeting. Book the one you feel you connect the most and you can visualize your wedding in their work.
DON’T book a photog with one style and expect them to change their work to suit you. Pick someone who you can totally see your wedding within their body of work. Their portfolio is a collection of their best work and you should be happy with the types of images they are representing. Spend some time on pinterest to get an idea of the types of wedding photos you like. Do you like more posed stuff or photojournalistic? Do you like sharp, crisp life-like images or soft vintage look.
Look for weddings LIKE YOURS in their portfolio. If you are getting married in NOV in a dark church and night reception then look for someone who is good at lighting. If they only show outdoor, natural light weddings then they probably not going to be a good match.
There are lots of pros on this board who love to help so feel free to post questions or PM me if you want me to help you to compare.
There is also a good thread here: http://boards.weddingbee.com/topic/advice-for-photographer-shopping