Good non-directional tire

I currently riding on 225/35/20 Nexen N3000, they are directional tires so when it is time to rotate I'll be only able to rotate back to front/front to back on the same side.  
 
Are there any good non-directional tires out there? Thanks for the any information.

a few pirelli, yokohama advan, and continental tires are bi-directional. they arent cheap though.

Are these a good brand? 
 
[URL]http://www.discounttire.com/dtcs/findTireDetail.do?tc=CONHZA&c=3&rcz=28147&pc=26288&ar=35&rf=true&cf=false&rd=20&sw=false&rc=NCKINT&cs=225[/URL]

Continental are OEM on Porshce, yes, they're a good brand, one of the best.  And actually, General tires are quite popular on here (I'm on set #2) and Conti owns General, so General benefit from Conti's development.