You won't be dissapointed with Premier.
Besides the first-class installation, their customer service is superb.
I've tried many others, but after having three cars handled by Premier, I can attest that they really are the best anywhere, bar none.
2013 E92 M3 Individual
Sold: 2011 E92 M3 SSII | Sold: 2008 E92 M3 SSII | Into a Wall: 2008 E92 M3 SSII | Sold: 2007 E92 335i JB