As to your question about paying taxes: If you buy from a dealer in your state he will collect the state sales tax and be responsible for sending it to your state's dept. of revenue. If you buy out of state then the dealer is not required to collect the state (your state) sales tax and send it in. However, you are responsible for sending the appropriate amount of tax to your State's revenue department. (This way your state's representatives will have money that they can dole out as they see fit to insure his/her re-election and continued culmination of power.)
Know this, most folks don't send in the appropriate tax. However, as more and more people buy through the internet, states will see a drop in tax revenue. More than likely the states will get together and come up with a system that solves this "problem". Currently, there is a push to have a federal tax on internet purchases. Once collected the federal government will send the appropriate amount of tax revenue back to the states...after taking their (the fed gov.) percentage of the sales tax.
As to the $10,000 notification rule, I'll double check on this today, but I think a bank has to inform the federal government whenever an amount of $10,000 or more passes through a customer's account...whether it be in the form of cash, check, electronic transfer, etc. it gets reported to the federal government. I'm a real estate investor and work with amounts over $10,000 regularly. Don't much like this rule.
Under the guise of seaching for drug money we all get checked. So much for the Bill of Rights.
Sorry, fellas, guess I've been watching and reading too much election material. I hate not being able to vote "for" someone, rather, I have to vote against someone.