I have got maybe a bit more info if you want it:
When I first went shopping for a 7string a while back, I sort of had a look round + talked to some of the people I know round there. The one place that sells 7strings (or did then, there's a few more now) wouldn't let you touch them unless you had the money (due to people coming in and "touching" the curiousity (there still aren't that many of them, I have seen a very beat up uv7bk (headstock with no logo, painted black, so many dings that it looks like a DBK) going for 1900$, which is cheap (due to the state of it), so I just asked about what he advised. I believe they had an RG7620,S series7 and the UV777. He actually said he thought that the S sreies was the best one out of the lot for value for money, and also, (i was quite surprised by this) for playability, as he liked the thicker chunkier neck. I think this is the S7420, as it had 2 humbuckers (and the one before has a H S S). And I do actually trust this guy (the shop he works in has a couple of people who will tell you that something is good because it costs more). This guy is a guitar player, and I find that here in london that because not many top of the range guitars appear, and because of how expensive they are here (we pay 1.5 to 2 times as much as you guys stateside, for almost everything) people tend to go for stuff that they think is good value for money. And value for money was the original question, i believe.
To be honest, yes, the edge trem is very good, but i still don't mind playing with floyd roses. Sure the TRS doesn't stand up as well to abuse like the edge does, but for normal moderate use (the occsional dive bomb, pull up) it handles OK, especially ifyou are OK with floyd roses. I imagine the 7string version is much the same. I've played the warlock7, and that has a floyd7, and the pull up and range aren't incredible, but it does OK, which is all I'd expect from a guitar to be used as back up. The shape + fell of a sabre is nice, the sound is quite cool (22fret neck, i presume, like the 6string) and it plays nicely. I'd consider getting one if i liked the neck.
I agree that it is nothing like an RG series, sabres are just different. So as something that's a deprture in wood/feel/etc, then I'd say that that's what you are probably looking for. Play it, and if you like it go for it. Sure the trem isn't as good as an edge, but hey, it's all about how the neck feels and the tone in the end, and I believe that s series are mahogony (correct me if I am wrong).
And if you decide you don't like the trem, you can always get it converted to an edge system with some routing as a small project later on. So i would say it's value for money, even if the trem is considered to be "inferior". Just remember that most other 7's use floyd rose systems, and not the edge, and people still buy them. Just because something is deemed best doesn't mean that everything else is a pile of wank. If it's japanese made, then the meterial quality should be good. Try it, and if like it, buy it. 800$ doesn't sound bad to me.
I hope this helps...
Don't worry, I sometimes get frustrated by some of the responses (or lack of) I get, but I know that sometimes I don't give the best response either. But on the whole I get quite a bit out of this site in some ways...(Even if i do contribute crap every so often
) Just to make a point as well, I am not flaming anyone here, nor do i ever intend to.
On a side note, GZeusEcchiQryst, you got an examples of the stuff you play? Wouldn't mind hearing it (I remember you saying something about wacky costumes on stage and stuff).
Sorry if this turned into a bit of a chaotic rant, Peace and all that stuff,