It begs the question Rob... is there a difference? John McCain will spend more money on national defense and keep entitlements in line to accomodate his voting bloc, seniors. The democratic nominee will spend more on national healthcare and keep entitlements in line to accomodate the biggest voting bloc (and growing) in the country, seniors.
Either way the government spends a shitload more money. This basic underlying point means that in the end we'll end up in about the same position. If the republicans cut taxes, it'll just hurt the dollar and we get screwed. If the dems raise taxes it'll wash by virtue of us receiving some services we used to pay for and the dollar maintaining a little strength. Neither party respects civil liberties, so I mean forget about that right now...
I have no qualms about how my vote for Ron Paul will affect the race strategically, because I understand that I'm voting for a bunch of centrist big spending authoritarian clones.