Sounds like a plan. Maybe throw in neither for the cloak qustion.
Don't know why I didn't think of google earlier, but here is a link to a warp factor calculator.
http://home.att.net/~srschmitt/script_warpcalc.html
Seems fairly acurate for TNG, I don't know TOS warp factors.
9.8 = 4472 times the speed of light
9.9 = 6555
approximately