I5 750 or i7 920 or 930?? is it worth an extra $89 for the i7?

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No, the only main advantage the Core i7 900 has is the Hyper-Threading, triple channel memory and dual PCI-e 16x lanes, none really help gaming apart from not bottlenecking CrossFireX/SLI setups. Clock for clock they perform similarly, with the i7 860 though it has a much higher Turbo Boost than either the i5 750 or i7 930, which means it will beat the two processors in games which do not use many cores.
No, the only main advantage the Core i7 900 has is the Hyper-Threading, triple channel memory and dual PCI-e 16x lanes, none really help gaming apart from not bottlenecking CrossFireX/SLI setups. Clock for clock they perform similarly, with the i7 860 though it has a much higher Turbo Boost than either the i5 750 or i7 930, which means it will beat the two processors in games which do not use many cores.
 
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