There are some groups that have a presence in the primaries without taking social-conservative stances, such as CLOUT and the Club For Growth. Unfortunately they seem to be single-issue groups on cutting taxes. Club For Growth says they're for "limited government" but I couldn't find anything on their site taking a stand on the Supreme Court decision on eminent domain. I'm sure taxes could get really low if the government just paid people by handing them fully built houses confiscated from former owners. I think "expanding freedom" is a better focus than lowering taxes.
One place where I might find like-minded people is in the movement to draft Condi Rice as a presidential candidate. Those seem to be folks who want an aggressive war policy but less government interference in our personal lives. Now whether Secretary Rice agrees with that domestic agenda is an unknown. It's also not that likely that she'll run, no matter how hard people try to draft her. Secretary of State is a full-time job, she'd have to quit to run a campaign. She's never run for an elected office before and would probably make some rookie mistakes. There's also going to be an incredible amount of personal abuse, at least an order of magnitude more than she's already gotten.
On the other hand--if she's running with Bush's blessing as his successor she might get the Republican nomination with a minimum of nastiness in the primaries. There'd be a Christian fundamentalist running against her which would probably make her look even more like a centrist. Imagine a centrist running for President--might even be the first one in twenty years to get more than 52% of the vote. The results depend on who the Dems nominate, of course. But that could lead to another lovely scenario--if Senator Clinton gets the nomination the US gets its first female president whoever wins.