I too have heard of EdGI. I hear that those parts are quite good and reliable.
http://www.edgicustom-usa.com/
I just recently upped my TM VSR rifle to about this fps. I currently have
laylax150sp spring
laylax spring guide
laylax red piston
laylax trigger trigger sear
laylax piston sear
laylax spring guide
KM Hop-up bucking
*PDI 6.01mm tightbore barrel*(on its way)
1 set of barrel spacers (made more with electrical tape)
As you can see...I went the Laylax road. There is also the PDI road in which I do not know much of.
I want a Teflon Cylinder...but I don't have the cash yet.
A zero trigger would be nice but again, I don't have the cash.
http://www.airsoftforum.com/board/2008-Vsr-10-Upgrade-Guide-t97319.html
There's a nice guide. a decent start to getting a good rifle.
And no...there is no cheaper way. Yes there is the airbrake mod, but your trigger sears will wear away any way leaving you to buy new ones.