Well, if you have bootmii as boot2, then you can easily unbrick it. Look at the disc drive light when you power it on, 2 flashes = bootmii, 1 flash = no bootmii. If you have bootmii as boot2, then you can use a guide in the bricked section to fix things, you do not need a NAND back-up for this.
If ou don't have bootmii as boot2, you can probably send it to one of our members with a NAND programme who will be able to install bootmii as boot2, provided your wii is bootmii/boot2 capable. You could do this yourself, but you would need a NAND programmer.