Oh you dirty dog you, going ALL THE WAY with flash :P
Seriously though, i would recommend getting a tablet, however, a cintiq is not neccesary. Go for an intuos 3, preferably a size that is not the very smallest one (4x6 i think) i've used one and have found that its really annoying when you try to draw something and your hand is rested on the rounded bottom half. (by rounded ... yeah, its rounded, and it sucks). Hurt my hand after a while.
Then again, the biggest intuos... like..12 x ..10..maybe? im not sure, i've used one of those too,and while its AMAZING, its overkill really. (my school has one of both) and to use it i had to push the computer back, and then get rid of the keyboard completely for it to fit. You can get amazing detail with the big one, its also like 600$ or so.
Another problem i have with cintiq is that if you do use it, you might end up smudging the screen, as the computer monitor IS the tablet. Not only that, your hand MIGHT get in the way of drawing something to the right of what you are drawing. (or left..if you're a lefty)
Me, i have a Intuos 3 6x8 and i think its a perfect size, but thats just me. Let me know which one your going to get!
Hope i could shed some insight on the topic
-Duchednier