Hi, firstly let me say welcome to the forums!
Just out of interest, how long have you been working out? I'm going to go out on a limb and say not all that long.
The girl behind the counter in the health food shop was surprisingly correct in her assessment of your protein needs! If you weigh around 200lb then you do need about 200g of protein per day to supplement your muscle growth.
I've not heard of Nutrisport protein before, but you should be looking at whey protein over anything else. I used to use something called Protein Matrix by Multipower - utter crap really, and I really noticed a difference after a few weeks of whey!
As people have said here, 135g liquid protein is plenty per day. If you carry on with this it will get very pricey, very quickly!! If you are relatively new to bodybuilding, may I suggest you look at maximising the amount of nutrients you can get from a healthy natural diet before you turn to supplements. Just about everyone needs a
protein supplement, but it's best to use it as little as possible for the obvious reason of cost!
Good
workout routine, lots of rest and a good diet first, THEN add any supps you think you'll need.
A good site for cheap UK supps is
Affordable Supplements . I've just ordered a 5lb tub of whey and a 6lb tub of nlarge2 gainer from them, 60 quid for the lot including delivery!!
Good luck!
Rich