Originally Posted by -HAL-

If you choose to get two domains then use a 301 redirect from the extra one to your main domain.
Don't put the same content on both since that will result in duplicate content, and that's a big no-no..

It all depends on the use if you should need hyphens or not IMO.
If you focus on SEO and getting you visitors from search engines then a hyphen could be good, but for a more "pro" site where word of mouth etc. is important then I wouldn't use hyphens...