I find it surprising when people compare US and Mexican strats, they say "not as well build". I mean, yeah, in terms of sound, there is huge difference between proper pickups in US models and cheap stuff in MIM strats, but as far as build quality goes - both US and MIM necks are from the same factory - from Corona, made on the same machines, going through the same quality control, just the stamp at printers is different. Hardware is pretty much the same, you'll find MIM strats with fender stamped sadles (flimsy and horrible design to begin with, but hey - if Eric can play it, so can you). Bodies is slightly different story - MIMs will have 5, 6 chunks of the same type of wood, often sandwiched together on top and bottom, but to be honest, Fender bodies in general are the cheapest junk on the market - US strats with solid colours are made of 3 to 4 pieces glued together as well - so yeah - it might be american ash, but they're more of a IKEA left overs than you would expect for the money. There is less glue and more quality sounding wood in korean lite ash Strat than there is in most of the sub $1000 MIA Fender bodies.
Effectively, if mid and top range MIM Fenders arrived in shops set up properly and with better choice of pickups, you would probably be surprised how little gap there is between your £400 MIM fender and £800 MIA Fender.
Washburn X-50 is a good shout, Seymour Duncan pickups in those are worth £80 alone, surprisingly well put together as well. Some limited editions, like spalted maple are just stunning. Sound suits heavier, perhaps even detuned clientelle though - sort of SE Tremonti, or Ibanez SZ kind of vibe. Perhaps it's slightly too specific sounding as a first guitar