I used stock 4x10 brackets, cut em to fit in the 6x9s. I'll try to get some pics if you want.
As for a decently priced CD player with MP3 input I got a Sony from wal-mart. It was about $120.
http://www.walmart.com/catalog/produ...uct_id=5148256
I was happy with it, pulled it out of my blazer before I sold it. Im considering putting in in my 07 Tahoe...