Tony ferguson....not sure if that's still available though.
I'm on exante and find it's the best as it's cheapest, no aspartame or other nasty stuff, it tastes nice and you can buy it online.
The only one I wouldn't do is slim and save because the site has a badge on it saying themselves that the packs dont provide 100% of your daily vits and mins so you have to take extra supplements.
If I'm doing a TFR I dont expect to need extra things!