James
The one from RRE for $50 is fine. You will need to get the assembly balance which is little more then $100 and you can sling 8-9k rpm no problem. Makes for lots of fun trying to hit the next gear.
Make sure you are going to use a underdrive pulley right away or you will need to get the stock harmonic balancer balanced with the assembly.
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V8 SLAYR
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Jeff Peterson - 2006 GTO - Cold Air Inductions CAI, SLP U/D Pulley, FAST Ported Intake, Ported TB, Kooks 1-7/8's, Spintech Mufflers, H-Pipe, Yella Terra 1.7 Rockers, Flowtech Hellion Cam, 255lph Pump, and GMM Ripshifter. 445rwhp 402rwtq SAE