I have a '01 SC CC 4x4. A few years back, my dad used to own a 01 CC 4x4 without the blower. My dads old truck is the reason I bought one myself (he got rid of his and I missed it dearly

), so I've driven both, and here's my opinion.
I always thought the 3.3 was a bit weak, and needed the extra oomph. I undestand it's a truck, and not a racecar, but I go camping/snowboarding/general fun in the mountains a lot, and I remember my dads truck struggling a bit up big hill loaded up with people and gear.
The SC solves that problem, but still leaves a bit to be desired in the performance department. It pulls GREAT in the low end. Reaches full boost and TQ (250) at 2800RPM. Problem is, it sort of falls flat on it's face in higher RPMs.
Don't get me wrong, it has more than enough power for what it is, and I'm happy I got the SC model, I just don't think it should be a deciding factor in the purchase. I just couldn't pass it up since I got the truck for a hair over 16K with only 42K miles. Fully loaded, leather, nice wheels, supercharged, and even came with a nice camper shell.
Also, things to watch out for with the SC is the bearings in the front. Mine went out shortly after I bought the truck. Luckily for me, I got it from a dealership and opted for a 3 year 36 thousand mile bumper to bumper warranty, so I got a new blower for free. weee.
I hope that helped some. The truck is great, you won't be dissapointed. When we sold my dads', it had just over 100K on it, and drove like it was new, despite being trashed on and off road for its entire life.
Good luck!