My husband and I just celebrated our 11th anniversary May 10th. We'd been together for 7 years before that. We co-owned a businesses and a ton of assests prior to actual marriage. You have to look into your relationship and see where you are comfortable with it. This a 2nd marriage for the both of us. This time around I kept my maiden name because of being older and more established with business and financial stuff. If you would feel better about it, as someone suggested, get a pre-nup on the house. As unromantic as it may sound, financial matters need to be address in a business way. The emotional roller coaster of buying a home, especially your 1st, will have you so starry eyed and if something should happen, neither party will remember anything anyone promised verbally. There is nothing wrong with protecting the each of you, separately.
We purchased a house to "sell" to my youngest step son and I wanted to address the issue of if he and his wife broke up. The 4 of us sat down to talk about it prior to signing papers and the other 3 right away said, "oh, it's not gonna happen, we're gonna be together forever" and hubby said, "we don't need to go there". Well, guess what? I had to go and completely rehab the house (he basically destroyed the interior along with his girlfriend, yes, his girlfriend). Since we'd set it up as a business proposition, I was able to kick them out legally and sell the house.
So if you and your bf are secure enough to address all scenarios and take necessary precautions to safeguard each other, then I would say go for it...it is a hellava buyers market if you can afford it! Good Luck with whatever you decide to do.
the other side of it, if you buy the house, compromise and have an intimate ceremony and/or reception in your new home, there are at least 2 less guests for your guest list!