Optimal is to get the absolute fastest processor that you can afford. SH3 doesn't require any more memory than other games, so 1GB is what you need. 2GB is a good investment. Graphics are actually fairly light, even at 1600x1200. Any $130-$200 card will do well -- 4x AA at 1600x1200.
I suspect that SH4 will fit the same profile. They might split some of the threads, letting a dual-core processor do some of the work, but I'm not counting on it.
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