I see that your wedding date isn't until May, so I wouldn't even worry about it right now. I just bought my dress for our wedding in February. It won't be here until a few weeks before the wedding, but that will give me just enough time.
In my opinion, if you aren't "feeling" a dress yet, then hold off and look in a month or two. I agree that marrying your best friend is the most imporant part, but you also want to feel gorgeous walking down the aisle. I say hold off for now and then start fresh.
Just make sure that you purchase something 4 months before your wedding because that seems to be the average ordering time.
Good luck....and try to enjoy the shopping experience!