I need to replace my flywheel for a VQ35HR equipped 07' 350z. My Mechanic is telling me 1k for the part but I've found a part through Z1 Motorsport for 350, should I get it?

What is your question?

My clutch s*** the bed. Completely. Needed full replacement. The mechanic is now telling me I need my flywheel replaced, and the part is gonna cost me another thousand. I'm calling bull crap. I did some research through Z1 motorsports and found a mid weight flywheel for $348. Mech is telling me he can put it in but it takes away the %100 guarantee and if something goes wrong they won't cover it. I wanna throw in the cheaper flywheel, and I know it's not a piece of crap. From what I'm seeing online it's better quality than stock/factory flywheels that are also running for around 1k. Should I put it in myself and say screw the Mech?