I agree with sp00n - Novritsch is riding the whole parts-endorsement gravy train a little too hard these days. He looks like a great shot, but that are many ways of getting good performance out of a sniper rifle and I'm not necessarily convinced his 'kits' are the always the best combination of parts out there.
I think in total without all the externals by VSR build is probably costing around £300-350. That's the regulator, base gun, hop unit etc. With all the externals it's coming to more like £450.
I've owned a highly upgraded L96 too (until this week actually) and I was never entirely sold because sniping has never been my thing. With the incredibly short bolt pull, very consistent shot-to-shot fps output (and adjustable fps), plus the very high volume of gas that it can put out is ideal for wider bore and R-Hop builds that can get close to that 100m mark. I think the SDiK is probably the most skirmishable sniper rifle setup one can buy these days on paper. Add to the mix that you can use either HPA or CO2 bulbs, and it's a highly functional rifle.
They make them for almost every major sniper rifle out there. Really it's about personal preference (as it always is). I picked the VSR because it's small and highly upgradable and has been largely regarded as being basically the most functional platform that you can buy (partly down to the vast array of aftermarket parts).
Certainly check out the Mancraft SDiK though. It's the way forward in sniping right now and a lot of people on the airsoft sniper forums seem to be getting onboard.