As far as taxes, what I have seen in the past 25 years is that the so-called conservative Republicans are not really conservative. We saw a huge growth of the federal government during the Reagan administration, when he promised just the opposite.
The Republicans and Democrats both will spend our money in big ways. The difference is, the Republicans seem to not pay for the spending, getting our nation into debt. That bird will come home to roost sometime. The Democrats are more on a pay-as-you-go basis. That's a big factor in the elimination of the annual deficit that occurred during the Clinton administration.
As to your point 3 about Obama being the Iranians' best friend: No really, it was the Bush administration that was their best friend. By going in and weakening Iraq, the USA tipped the balance of power Iran's way. That horse has already left the barn, and now America is spinning its wheels in the quagmire that is Iraq. There is no more progress being made toward a permanent political solution now than there was 5 years ago. America is mortgaging its future spending billions a month in Iraq, money which could really be used to strenghthen America in so many ways (development of renewal energy sources is just one of many examples).
As to your point 5 about negotiation, from what I've seen you'd better get your enemies to the negotiating table. All the peace treaties that ever occurred was from enemies coming together and finding ways to compromise. The national security advisor to presidents Ford and Bush 41 was Brent Scowcroft, and he knows a thing or two about international relations. He totally agrees with Obama's idea to get our enemies to the table. Link: http://www.huffingtonpost.com/2008/04/28/brent-scowcroft-echoes-ob_n_99026.html