I think you should get sh3 with those specs and it will run fine
you "can" run sh4 with the v1.5 uboat ad-on and it will run "ok" but im sure there will be situations of slow frame rates with it.
sh3 is the german U-boats against English warships in the atlantic and sh4 is the US fleetboat subs against Japanese warships in the pacific theater
at some point im sure you will get a better computer so I would suggest you get sh4 with the ad-on (the gold edition comes with it) and then also get sh3 as well.
they really are two separate games so they are both good to have.
as fitz mentioned, you cant run sh5 with such an old computer so that ones out and just personally, I have it, but im not that impressed with sh5 at all and don't even play it, when I play its sh4 with ad-on
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