spoiler recommendations needed

[mark-s]

The car is a white 2014 A5 black edition. I've had wheels powder coated glass black and diamond cut and the wing mirrors, rear diffuser, side blades and front grills painted gloss black (the same as the 'plus' edition) but I'm now considering a few more changes.

I'm looking to swap the front bumper for the 'plus' edition version and I'm also going to add a rear spoiler. For the front bumper I'm going to try and get hold of a genuine bumper but I'm not paying £400 plus for the 'plus' edition rear spoiler.

So Ideally I'm looking for recommendations for a tasteful rear spoiler. Also if anyone knows a site I can use to get part numbers it would be much appreciated.