What are you looking to gain by replacing a head gasket that isn't bad? If you aren't solving a problem, you're going to exert a lot of work (and some expense) for no gain in the end. Unless your head gasket is blown out between an oil passageway and cylinder, it won't do anything for your oil consumption either. There would be other signs of oil passage being blown into the cylinder like a bouncing oil pressure gauge or oil starvation symptoms to the valvetrain. If the valve stem seals have been replaced, about the only other place oil consumption takes place is from worn cylinder walls or worn out/clogged rings, neither of which a new HG will address.

Sometimes things are better left alone.

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]