Just a side note to this. For SEO, the TLD is really not going to matter other than if you grab a geo-specific TLD and are trying to rank outside that area.
For paid advertising or any kind of click through ads you are running, it also will not matter.
However, if you are planning on getting people to return to your site on their own, I probably would not use any alternative TLD without also owning the .com version also. People are very used to typing in .com at the end of domain names. If you build up a following, you are likely to also inadvertently generate traffic for the .com version (a competitor) as people type that in out of habit when meaning to visit your site.
