While you will always have a large portion of the country who are social conservative. With Romney, these issues are of secondary concern. Political parties evolve with time and if Romney wins AND is a successful President he will evolve the GOP. I can see pockets of the NE and Mid-West where people are less socially conservative but more economically conservative becoming more GOP and the social conservatives being a bit more marginalized.

The larger concern is congress, not Romney or the Presidency. Both parties are increasingly radicalizing their folks in congress. Moderate GOPers are losing primary battles (Hatch is in the race of his life right now) to very conservative folks and "Blue-dog" Democrats (who are the Dem moderates) are in the same boat and being replaced with socialists. Now, where one should consider supporting Mitt in this scenario is due to the fact that Mitt is moderate, Obama is not. Obama aligns more with the left-wing dems whereas Romney is not at all aligned with Right-Wing GOPers. Basically the extreme partisan and divisive politics will continue under Obama and should alleviate with Mitt. Especially consider that Mitt demonstrated that he could work across the aisle. Regardless of one's opinion of Romneycare, he worked closely with both parties in the MA House and came up with a solution that is largely approved by the MA electorate. Obama on the other hand hasn't shown an ability to bring both sides together (and yes, I know GOP in congress is as much to blame), despite is campaign rhetoric as a uniter.

Considering you are on the fence, I think Mitt is your best bet. Economically aligns more with your ideology (and consider nothing is more important than a solid economy, if the economy collapses so does everything else) and he is moderate and has a track record of working across the aisle.