You are pretty much fucked if you wanna buy X360 now for flashing. Nearly all consoles made after this March include LiteOn drive. BTW flashing drive doesn't void warranty, but when you send your console for repair MS almost always replaces drive with LiteOn, even if the previous drive was fine.
C2D E6750 @ 3.2Ghz, 4GB 800MHz DDR2 4-4-4-12, GeForce GTX 260 c216 OC 896MB, 3.2TB, Windows 7 Ultimate x64
Xbox 360 Elite, PS2 Slim, Xbox