ok... new list:
official height
u/c or completed:
1/burj dubai/2650ft*
...shanghai center, pentominium, and russia tower would be 2, 3, 4, but they aren't u/c yet according to the ctbuh
2/chicago spire/2000ft*
3/abraj al bait towers/1952ft*
4/china 117 tower/1870ft*
5/doha convention center tower/1808ft*
6/freedom tower/1776ft*
7/taipei 101/1667ft
8/federation tower/1660ft*
9/burj al alam/1644ft*
10/swfc/1614ft
...and for all the spire haters...
roof height
u/c or completed:
1/burj dubai/really tall*
...russia tower would be 2
2/chicago spire/2000ft*
...shanghai center would be 3
3/china 117 tower/1870ft*
4/doha convention center tower/1808ft*
5/burj al alam/1644ft*
6/swfc/1614ft
7/international commerce center/1588ft*
8/taipei 101/1470ft
9/sears tower/1450ft
10/kingkey finance center plaza/1440ft*
info from: http://www.ctbuh.org/