I'm not really surprised, but no-ones mentioned gas!
Gas is the way forward, IMO. Most realistic snipers, they look much better and feel significantly less toy-like than the VSR or Warrior L96. Can't comment on the Maruzen, haven't even held one

Though I'm considering getting one.
You can buy a KJW M700, put a VSR bucking and barrel in it and you're set. After time you can replace internals with G&G steel parts, which are readily available from pretty much any HK site, and if you're that worried about consistency you can build a Co2/HPA rig and you're going to end up with much more consistent results than a VSR (depending on the quality of your regulator) You can even go down the solenoid route for an FPS variance of 0, but that's getting complicated and I'd be happy with a variance of 2FPS+/- tbh. Using green I get 6+/-, which is pretty shocking for VSR users but I'm working on an internal Co2 rig design so I don't have an ugly coil line outside of my rifle. I hate them, but it's a personal thing.
They also have the advantage of a zero resistance bolt, realistic disassembly, correct mag placement without the need for complicated mechs. The more parts there are, the more parts can go wrong
Gas is a very simple and effective system, and the Tanaka takes it to a whole new level of quality compared to the KJW.
Though the KJW takes VSR barrels + buckings + AEG hop nubs out of the box, the Tanaka needs a chamber conversion and still doesn't take AEG nubs as far as I know (not without modification).
Also, gas rifles are much quieter than spring, and silencers come into a world of their own. Yes, mags are expensive which is the biggest downside IMO, but if you're a serious sniper (or even if you're not, you just have the one mag maybe?) then you don't need to have many mags anyway. Yes mags are nice, but not a must have.
The KJW setup, with VSR barrel + bucking, will cost about £180, if you pick up a fully functional second hand KJW M700.
With Co2/HPA rig, I've heard that you can make them from as cheaply as £50, up to as much as you want to spend.
Mags are Tanaka compatible, same with the bolt and pretty much everything apart from the bolt nozzle (the tanaka one thins out, the KJW doesn't) and the hop up chamber and subsequently the inner barrel.
You might be able to tell, but I'm slowly morphing into a Gas sniper fanatic