NO, without even reading what you already purchased: no, not nearly enough
*pause to read what you purchased*
Hrmmm, average of 4 beer per person. Odds are not everyone will drink beer, you can bet that on average the ladies will be drinking mixed drinks. For those that do drink beer, you'll have the odd guy that will be on just the hard stuff. Throw in 4 bottles of wine per table.
Personally I think you'll be fine. It's not like you're wedding is in the Maritimes
That said, having never been to a wedding outside of the Maritimes before (come to think of it Nova Scotia) what is the rate of wedding crashers? What I mean is, not Owen Wilson, Vince Vaughn, and Will Farrell, but people you're friends with but didn't make the cut to get an invite? Where I'm from it's generally casual friends who might be good friends of invitees, people that are friends but don't make the "we have a budget and can only invite 100 people" but you want them to be there, crowd. Do you have many of these people? I know if I was to get married tomorrow my wedding would probably be about 150 people, and the reception the number would drastically increase.
You have to think of the wedding crashers. Even so, you're probably ok. Is there a cash bar if the alcohol runs out? If so, screw'em go with what you got.
On a side note, a wedding I was at last summer the bride and groom said in their thank you speech "we put $1000 down at the bar, from this point on have a drink on us". That basically was open bar the rest of the night for a small wedding of mostly family and close friends.