Intel Core i5 iMac enough?

[AnyOldName3]

Except for the fact that 3.5 supports HL(garbage data creation) not HL(emulation) for the audio (invalidating his first reason), and in most cases, builds after 4.0.2 will be faster than 3.5, as there've been a tonne of optimisations, and you can, for example, use HLE in Zelda microcode games without crashes, meaning you can avoid the slowdown of LLE, which you're forced to use in 3.5.