Which Groupset?

I posted this in any question answered but I guess it's pretty relevant to here as well.

I want to build an audax bike to do some light tours and need some advice on what groupset to buy. I know I'd like STI shifters and it'd to be silver (kind of classic looking and not modern) but apart from that I have no idea.

Any ideas?

Shimano 105 or above. Sorted.