Tahoe is incredible. I lived in Vegas for a number of years, and personally I can't imagine ever getting married there. However, maybe compromise with FI?
Vegas has beautiful ceremony locations (other than the Strip) and I put a few suggestions below. Then, you can go for a mini-moon to Tahoe right after!
Also, Mt Charleston about an hour outside of Vegas would be beautiful for a wedding :)
http://www.g-mansions.com//?utm_source=Ideal%2BPositions&utm_medium=Google&utm_term=Las%2BVegas%2BWedding%2BVenues&utm_campaign=Ideal%2BPositions
http://www.lakesideweddings.com/
http://www.springspreserve.org/
http://www.rgevents.com/index.html
There's plenty of traditional wedding options in Vegas, you just have to look.