Got this kit from ebay for £16 of replacment interior leds . Plug and play
As i already have ambient light pack on my car i only had to change dome, boot and door puddle for led
New oem bumper is £700-800 + paint job. Probably even more if you want to get it from audi
There are few on ebay worth a look
Look at this on eBay http://www.ebay.co.uk/itm/263270098608
Hid kit is right for your car . Re quality lets face it . They all come from china haha. Cheaper or expensive one may last a week or forever . But i recomend buying from a uk based seller so you always have easy route for any warrantie claims after.
I think this is a good choice. Slimeline blasts are a bonus. They do get hot so when instaling its good to find a place a good place for them away from any whiring .