Do check out the serums from Estee Lauder, Kiehl's, Farsali, The Face Shop and Its Skin
PIXI has great products but are a bit expensive. Though Nykaa also has face serums at a decent price.
Indulgeo Essentials, Estee Lauder, Dot & Key, Forest Essentials have some of the finest range.
My personal favorites would be Farsali care and PIXI if budget is not a constraint. But if I have to go for something that wouldn't hurt my pocket, then I'd definitely pick Khadi or Juicy Chemistry.