I'm needing to order some fondant for a retirement cake. whats the best tasting one out there? Also how much would i need for a 12in and 8in double layered cake(4inches high each)

There is a very good chart posted by Global Sugar Art (provided by Satin Ice) on fondant amount:
http://www.globalsugarart.com/?id=24

"Good" taste is subjective . I like Satin Ice for good vanilla taste and reasonable price or Massa Grischuna if price is not an issue. Chocopan and Fondarific are also good brands to my admittedly unsophisticated taste buds, and FondeX is probably the most neutral-tasting brand I have tried.

One of the best tasting fondants I've ever had is Fratello - they say it's vanilla flavored, but I get more of a coconut taste, which doesn't really mesh well with all cake flavors...that and It's a bit too soft for my liking...

My vote goes to Satin Ice

personally I like the taste of 'Fondarific'

my favs are Choco-pan and Massa

I used Satin Ice exclusively, but I have been playing with Fonderific lately! It's very expensive however. And it takes some time getting used to working with.

But it's by far the most delicious fondant I've ever tried! And no shortening or powdered sugar are needed when rolling it out!!

I use Satin Ice as well. I still would like to try Fonderific.