I have a micro 4/3 camera, thanks to the advice on this thread.

I have a Lumix G3 with a 14-42mm &
Lumix G Vario 45-200mm

I'd say 75% of the photos I take are while hiking, and so a wide angle lens is next on my list. I don't normally have a tripod with me.

Currently I am trying to decide between the Olympus M. Zuiko 9-18 & Olympus M. Zuiko 12mm after determining the Panasonic 7-14 to be too expensive in the UK.

I am currently torn as 9-18 sounds perfectly good, and I am used to having some zoom range, however the 12mm is supposed to be great and I don't have anything that can do f2. It would be nice to take the occasional photo of my husband's band in low light, but maybe the 12mm wouldn't be ideal for that . I'm still fairly new to photography.

Could I get some advice about what would give me the best overall range of usage in lenses?

Many thanks for any advice.