integrated or pre with ht pass for paradigm 100

im undecided on if i should use a pre amp or integrated amp for 2 chanel listening that will be used with home theater set up all paradigm studio series version 4 thanks
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Why not just use the the HT system's pre-processor and amp to drive the Paradigms? Most pre-pros will allow you to choose Stereo as one of the surround sound modes. I am doing exactly this with my HK Signature 2.0 pre-pro and Signature 2.1 5 channel amp and it sounds *great*.

Try this first and see how it sounds to you...(I bet it'll sound great!!)