I have a Mexican Robert Cray Strat which is excellent, better than most of the US Strats I've owned. The last Mexican Strat I owned felt a bit "unfinished", but the build quality and detailing seems to have improved a lot in the last few years.
The Standard series are fine for the money, but the hardware's a bit ropey and they just feel rather bland and mass-produced. If you can stretch to the more upmarket Mexican models like the Classic and Deluxe series they're quite a step up in quality, with much better (vintage-style) hardware and good pickups.
For about £400 there are the 50s and 60s Classic Player models which Twinfan mentioned, Custom Shop designed with nifty features like improved modern-vintage trem systems and proper Custom Shop pickups - there's only a choice of 2 colours for each model though. I was going to get the 60s one but got the Robert Cray for the hardtail bridge.