IMO, Id rather spend the money and buy the real thing then at any point if you fancy a change then you can put the OE one back in.
http://www.tuning.co.uk/vauxshop/
The one here C0120210 is a ABS grill all ready to fit the Chevrons you even get the mesh supplied. I got my Badgless grill from here. Plus got it spray by local Bodyshop for only £20, but thats IMO :-)