We did Vegas for our 10th. My dad was getting remarried there, so we combined the two events. We did it for less than $1500, and stayed 4 nights/5 days - which was plenty of time for me.
We stayed at the Monte Carlo, saw two shows, and really enjoyed touring all the resorts. We aren't big on nightlife or gambling, had a great time, but were really ready to go home at the end! We went to the Hoover Dam, too, which was neat to see - but rent a car and drive yourself, don't take a bus tour.
Where in VT do you live? We are in Hartford.
Edited to add: How does your DH feel about renewing your vows? Mine is adamantly opposed to it, he thinks it was bad luck, and he said all he needed to say the first time. My parents renewed their vows at my wedding (their 25th) and were divorced five years later, so DH thinks it is bad luck.
Denae