Carter's for sure because it's practical - not too expensive and very nice quality. (Also, I live near an outlet and have signed up for their coupons, so I can usually score a 20% or 30% off coupon just by opening my mail.)
For more special things, Ralph Lauren (though if your DC's arms tend to be chunky, the sleeves are a bit narrow), First Impressions and Rare Editions/Rare Too are fun. DD had two seersucker sundress sets from Rare/Rare Too that I absolutely loved.
I also liked Hanna once she'd stopped spitting up after feeds and we got into Tea a bit late because it's so pricey (and tends to shrink.)
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle