I live here in Vegas and have renewed several times. I also work for wedding chapel. Here's my recommendation. If you really insist on getting married inside the Paris or Bellagio go ahead. But you will be spending a ton of money and minimal things. You will also only have some prints from the photographer (who works for Cahsman) and they charge $10 per image for the CD copyrigths. Meaning if they took 150 images, you will have to pay $1500 for the CD after the ceremony.
Better suggestion...play a small more simple ceremony. You can have a minister meet you somewhere, say in front of the Bellagio fountains, in suite is a room overlooking Paris or Bellagio, The Las Vegas Sign, Red Rock, Valley of Fire, etc. There are ton of places you can have a ceremony. OR have a simple ceremony with a chapel for $200-$500 then have your photos done on the strip afterwards. The latter is my choice. For a small, simple ceremony with 20 guests, try hapel of the Flowers, Chapel of the West, or Wee Kirk of the Heathers. These are also the 3 older, nicer chapels in Vegas and have that historic feel.
For photography later, I'm using http://www.gomoxiestudio.com/. I've met with her. She's amazing and open to great ideas, too. Very skillful and very reasonable priced.
KEEP IN MIND, whoever it is you go with, you will want the CD of your photos! You will not just want prints and then have something happen to them and then you have not. Negotiate or purchase your copyrights.