Here are a few to try.

I'll make another recommendation for Gaelic Storm who just released another great CD.
Fun, upbeat celtic music and great live show.
http://gaelicstorm.musiccitynetworks.com/

A mixture of both traditional and
a little more rock in their mix would be Rathkeltair.
Their piper is Neil Anderson. He is in Iraq right now but he is the
piper in all their recordings and most of the early Seven Nations cds.
He is hands down one of the best pipers I have ever seen.
http://www.rathkeltair.com/

For a very tribal beat try Albannach.
http://www.albannachonline.com/

If you like it more Scottish traditional, I highly recommend
the old blind dogs. Rory Campbell is their piper and he is very tallented as well.

http://www.oldblinddogs.co.uk/