Ronda,
You ask 30 WLS folk what their protein of choice is and you'll get 40 replies!
In all seriousness - protein is very much a personal choice.
I relied on the New Whey 42 vials (GNC) early out. Half a vial in a bit of water and I got 21g protein.
Carnation Instant Breakfast (no sugar) isn't bad - you can make it with fat free milk and kick it up even further with some ff powdered milk.
These days I drink Isopure low car (chocolate) or Champion Pure Whey Protein Stack (good stuff - expensive but worth it IMHO).
The Stallone puddings from GNC are pretty good too - I liked the banana one and the chocolate too.
Good news - if you've still got the receipt for the protein you got from GNC, you can take it back (provided you bought it within the past 30 days).
A good idea is to go to vitalady.com - she has sample baggies of a lot of protein powders.