@BlueArrow - TLD domain or not, if SpamAssassin counts against it, it is what it is. Personally, I'm looking for the cleanest emails I can deliver and if that means using a .com instead of a .info to save .2 on the scale, I'm all for it.
either one, they are both about equal in the eyes of the indexers; some ccTLD's are penalized a bit more heavily than others, but .us, .co.uk, .ca and some others are not bad.
and I'm tired of repeating myself that you do *not* have to be a citizen of the States to register a .us. Look up the damned nexus agreements for any TLD you're interested in, or just apply some creative thinking to it.