Xenon to H7 conversion

Hi,

I have a 2001 C320 and both of my xenon bulbs went out.  I called the dealership to ask for the replacement and they said they need to see the bulb to give me a quote.  I took the bulb out and took it in.  While the bulb was out, the burner burned out.  And now the total cost to replace the one burner and 2 bulbs is about $2500. 
I am wondering if it's just cheaper to convert to H7 lighting units.  If anyone has a list of parts I'd need and directions to do it, I'd greatly appreciate it.  I do know that the bumper needs to be taken off in order to replace the light housing.  The bigger problem is replacing the wires.  Is it seriously complicated? 

Thanks,
Harv