Awesome. Definitely liking the look of that lens.
"The OP"
wants to build up his OM system from a single lens to a set of decent quality range of options that'll cover most bases to begin with, without shelling out a lot of cash on a system I'm not totally sure I'll stick with. @flavio81 gives some good advice - there's nothing more annoying than investing in a new lens only to find it's only marginally different to one you already own!