I agree on the Kalloy stem. best value on the market for about Any bike component. Bars ... CF is nice, but as people say, you can get Al for around 210 grams and they are probably safer .... i have both and haven't died, I am not one of the "asplosion" freaks, but why go to CF is Al is just as light?
If you just want to go all CF for no reason but that you want too ... cool. Do it. But what does it matter, which order? If you can barely afford one or the other, i'd question the value of the investment. But .... since it is your cash ... flip a coin.