Like some of the other fellas have said, from personnal experience I'd seriously recommend getting a Fender Jap strat. you can get decent secondhand ones off ebay for around £250 - £350 'ish.
They really are just as good as American standards/Mexicans/highways etc. in my humble opinion.
About 6 months ago I was in a similar situation to yourself, thinking about up grading from my trusty Korean made Fender Squire, which was a good guitar to learn on , but my Jap strat. just sounds and plays amazing , the stock American vintage pickups are pretty good.
I recently fitted a set of Irish Tour pickups and its just an awsome guitar now, I use a Fender super 60 vlave amp, all I can say is that it ROCKS ........ + you can ease off and get all those sweet , warm Strat tones too - it does it all between the guitar and the pickups.
I can honestly say i don't think I'll ever need another guitar now.