^ good answers.
The only reason I can think of off-hand to fund a traditional IRA instead of a Roth is if you can deduct the contributions, and then it still depends on your personal situation.
Otherwise, if it's all after-tax money, I'd put it in the Roth. (free advice is worth what you paid for it)
No.
This is entirely a personal financial and tax decision. You might want to consult with a competent professional tax advisor who can help you assess your personal situation.