Re: Front 6x9 and Rear 6.5 Fills Help
Go with the Pioneer/Premier REVs, IMO.
I'd highly recommend pooling your money for getting just 6.5" comps up front and ditching the rears to start.
You can get good quality pre-made MDF adapters. There's a seller on eBay that makes and sells them.
Are you planning to amp? What kind of equipment do you have so far? What kind of vehicle?
2010 Kia Forte SX
2009 Kia Borrego EX 4x4
Setting Amp Gains:
Bought from: jacobcopeland87, 95bat, alxmlr789, na_rsx