go with the genuine mb gasket, since this is a pretty big job and it would not be fun to have to do it again.
victor reinz: from personal experience, bought a valve cover gasket 2yrs ago, and it now leaks oil to spark plug holes.
a couple of other people that had problems with VR gaskets:
http://www.peachparts.com/shopforum/tech-help/315782-m116-lower-oil-pan-torque-victorreinz-gasket.html
EDIT: forgot to mention that i replaced the front crank seal about7yrs ago / 30,000 miles ago with genuine MBseal , and it is still holding up well.