I recently bought SHIII and SHIV + Uboats off of steam. Got all of them for $30. I don't beleive SHIII from Steam has starforce, but I'm not positive.
If you get SHIV off of steam, make sure you let SHIV download completely, before you let the U-boat expansion download at all. If they download at the same time, it really messes things up.
I'm running the exact same system you are. I have SHIV turned to max on everything, and it looks great and is nice and smooth. I don't know the FPS, but it runs nice.
I personally recomend the RFB and RSRD mods, I am enjoying them very much. I never did play the stock version of SHIV though.
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