You should go for DP55KG.
The processor you have selected dosen't have inbuilt graphics, so even when you use DH55TC which is having onboard graphics support it won't work. You must use one additional graphics card on DH55TC.
DP55KG dosn't have inbuilt graphics, go with Core i7 870+ DP55KG + External Graphics Card ... You will get one extreme performing machine...
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+1 for the DP55KG
Thank you very much for your response. I tend to agree, that's the way I've been leaning. I don't know why they suggested the H55.