The smaller your starting stack and the faster the blind structure, the more variance in tournament play. With regular MTTs you can expect as much as 200-buyin variance, but with turbos it gets to be closer to 400. The super turbos with 1 to 3-minute blinds probably have a variance of about 2,000 buyins because they're pure lottery, especially if you've got opponents who time out every hand they fold (as some of the more skillful super turbo players do). Of course, it depends on your skill level at that type of tournament and the quality of the opposition.
I personally like the cheapo guaranteed rebuy turbos. In the ones I play on Party, the buyin and entry fee are $1.60+.40 and each rebuy/addon is $1.60. There is typically a 1K to 2K guarantee. The rebuy round is wild and loose with six callers seeing every flop and frequent four-way all ins. If you play smart, tight poker you can see only one flop in the first hour and still quadruple your stack. That happened to me yesterday! Then, following the addon break, about half of the remaining field fail to adjust to the new playing conditions and get eliminated quickly on stupid shoves and calls. The only drawback with these tournaments is that it typically takes about four hours to make the cut and as long as 11 hours to finish 1st. The positive is that you stand to win $900 on an $8.20 investment, which ain't too bad even if it takes 11 hours.