Lose the AS altogether.
You're way better off going a mix of chunky damage and CDR on Nasus.
PERSONALLY I think you're not going to ever beat a super tanky + CDR Nasus.
IF you wanted to build heavy damages, this might be a good build;
Warmogg's + Atma's + Infinity Edge + Triforce + FoN or QSS.
If you want what I think to be the best Nasus build out there, you can basically look at Jhoi's core item sequence in her Nasus guide.
You're way better off going a mix of chunky damage and CDR on Nasus.
PERSONALLY I think you're not going to ever beat a super tanky + CDR Nasus.
IF you wanted to build heavy damages, this might be a good build;
Warmogg's + Atma's + Infinity Edge + Triforce + FoN or QSS.
If you want what I think to be the best Nasus build out there, you can basically look at Jhoi's core item sequence in her Nasus guide.

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime
And he gets an HP bonus which is used better by resistances~

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime
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I'd like you to read the stats on Trinity Force and then come back and tell me how Nashor's Tooth is better. TF compliments his kit really well.
CDR is better coming from sources other than an item such as Nashor's Tooth for a champion like Nasus, not to mention it contradicts going "heavy AD" and would not be very gold efficient for him.
Well, we could replace