For those that don't want to go with the lowest setup(SuperSports/Coilovers), here's a good deal I just jumped on.
AutoAnything has a 15% off sitewide code and Eibach is having a 10% rebate offer, so total shipped ends up being ~$207.

 

Will the Eibachs work on the 4Matic

 

Yes. Eibach's site doesn't differentiate between 4Matic and Non. Part #2578.140 fits C300 Sport, Luxury, and 4Matic combos according to the fitment list I saw before purchasing. As usual, standard disclaimer applies, i.e. don't take my word for it!

 

Doanster - thanks, may jump on this.

However, I noticed on sub-models, that only the RWD C300 and C350 are listed. This is just information for other people, seeing as I own a C300 Sport RWD.

Thanks again for the find!

 

Well there you go. 4Matic owners better double confirm before purchasing!