Really depends on your skin type and what it is you are after in a moisturizer.
I have combination skin and I personally feel the best moisturizer I have used is Chanel Hydramax. I use the Cream in wintertime and the Gel in summertime and this leaves my skin feeling soft, hydrated and non-greasy.
Also comes in another version, Oil-free gel which is probably better for someone with oilier skin. Each cost $40
If you're after something with an SPF, lots of people rave about Lancome Vinefit SPF15 and also an Estee Lauder one (either Daywear or Lightsource, I cant remember).
HTH