Thermalright Ultra-120A & Antec 300

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Will the Thermalright Ultra-120A fit in an Antec 300 ok?

Or, should i get:

Noctua NH-U12P

Or:

Noctua NH-C12P Heatsink

My system specs are AM2 64 3200 X2 CPU, 4g 8500 Ram, 320g sata HD, Onboard Graphics. Antec 300 case (Lovely case!)

 

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Whats the temps like with the True? It needed lapping?