OK, first a couple of questions that will allow us to help you a bit more:
1)What country do you live in? Some of us can tell you lots about the used/new guitar market in the UK, best places to buy, good deals, general prices etc but know nothing about portugal or vice versa for instance.
2)What do you want the guitar for? Style of music etc.
3)What do you want in this guitar, how much (ab)use do you give the trem? How important are pickups? How important are looks?
Finding a used RG5xx or S5xx is your goal, they may be a bit beat up, but as long as the neck is OK you'll be fine. Finding one second hand for 750€ shouldn't be too bad to be honest. That's roughly about half of what the s540 cost me several years ago. And the step up in hardware is definetly worth it, as is construction. And if the finish is damaged, strip it and refinish. Also, you won't lose money selling it on. Besides, if the neck is gorgeous and it plays, then who cares what it looks like (well, almost!
If you want to import one from the US, it'll probably work out at about the same price as second hand here, maybe cheaper if you can lie on the "how much is it worth" form.
If you have your heart set on a brand nerw spanking guitar (and they are nice) then try them both out, you're bound to fall for one of them.
However: A lopro edge is nicer. Really, this is not just some "i've got this trem and you haven't" superiority hype.
Also, I do like buying second hand. It's how I got my UV's, and they both turned out OK.
But personally I'd hunt out one second hand and give it a good loving home