Should money from my RO IRA be used to pay the taxes or should I use the cash I have in hand to pay the taxes?
If you use the money from your rollover to pay the tax, you will be reducing your IRA investment. To maintain it you should use available cash on hand to pay the tax.
As a side note, when I did my initial conversion from my rollover IRAs to Roth I converted the amount I wanted over a five year period while keeping my tax level within the 10% level. I had cash outside the IRAs to pay the tax.
People should not say everything they think. They should think about everything they say.