Can't offer any real advice on your system specs, but the Gold Edition, which you'll need to update to version 1.5 contains both the Uboat Missions (which contain the 1.5 update) and the main game, and will be a lot cheaper on disc. I bought SH4 from Steam and ended up having to buy Uboat Missions that way as well, so I spent around £30 in total - on disc you can probably get it for half that!
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