if I'm not wrong, the problem w/ no-ip is only forward to only 1 port and users can NOT get the good use of virtual host which is used for more than 1 website/domain, so here what I did
I've bought my domain JLBN for $3 a year, then sign up for free account at zoneedit, and now my computers can host more than 100 websites; of course, have to pay for high speed internet. Last year, I've changed isp 3 times since they block port 80 when finding out I've been running webserver.
In short word, you'd better change your isp then change default port 80, since you loose ability to use VH, FTP, SSL, webdav, so on
Have fun,
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