There is no stock answer. I would suppose more of this is dependent upon your budget than what you "should" pay. Of course, this may offend some on here, but I think you would find most serious professionals (that have been doing it for more than 2-3 years) would be over $2,000. Maybe way over, depending upon the quality of the work.
I tell all my brides to search for people (whether DJ's, Bands, Caterers, etc.) that care. You don't want to hire a photog where it's just another wedding for them. OR sends their junior associate. Make sure that if you LOVE the work that they're doing, that THEY are the one that will be taking the photos at your reception. Basically, get out there, visit with some photographers, don't stop at the first one that you come to (even if his/her work is awesome) and find one that bowls you over. Then, as much as you can, try to afford them. 
This is a biased opinion, of course, but what else will you have in your hands a year from now? So, perhaps the most important expense of the day! If you end up spending $8,000 and you get awesome work, have you spent too much!? I don't think so. Let us know how it goes. This should be an interesting thread.
PS - I would LOVE to come photograph your wedding!! 
(You're not that far, either)