Which lens for traveling and retail design?

my wishes

- zoom lens!
- good in low light
- low f-stop (at least 2.8)
- working for MFT

my options:


Olympus m.Zuiko PRO 12-40 f2.8 ED 
bhphoto.com
+ autofocus
+ image stabilization
+ wider zoom range than Panasonic Lumix
+ fixed focal length
- very high price: 1.400€ (new), 800€ (used)
find here: 


Panasonic Leica DG Vario-Elmarit 12-60mm f2.8-4.0 Aspherical Power OIS
bhphoto.com
+ autofocus
+ image stabilization
+ wide zoom range
+/- price: 999€ (new; Mediamarkt), no used found
- not fixed focal length
find here:

Panasonic Lumix G X Vario 12-35mm f2.8 Aspherical Power OIS
bhphoto.com
+ autofocus
+ image stabilization
+ fixed focal length
+ aspherical
+ price: 819€ (new, Saturn/Mediamarkt), about 620€ (used)
find here:
Panasonic Lumix G Vario 12-35 mm/ F2.8 ASPH./Power O.I.S. schwarz


others that caught my interest:


my result:
- used Zuiko 12-40 2.8
or
- used Panasonic 12-35 2.8

I prefer the Zuiko but the price tag is just not what I am willing to spend on this lens.

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