isexbiz.com
2 extensions in one, sounds weird - less than $100
pchat.com
Doesn't look cool but could appeal to a geek company or community - less than $300
sportsportal.net
The word 'portal' is generally assumed. The word was great back then where techlingo was revered like manna from heaven.
Could sell to an internet newbie wannabe for $300-$500. $1k+ if you are lucky.