i am looking to get the Pioneer AVH-P3100DVD for my 2006 Mustang Coupe with the Standard 4 Speaker setup !

http://www.crutchfield.com/p_130AVHP....html?tp=20217

this unit only has 2 PreOuts

will this setup work?

4 channel Amp connected to one PreOut, with 2 front door speakers attached and 2 rear speakers attached to the Amp

and

a MonoBlock Amp connected to the 2nd PreOut, with a Sub Connected to the amp

===============================================

or should i go with the 4100DVD which has 3 PreOuts

one 2 Channel amp for the 2 front door speakers

one 2 Channel amp for the 2 rear speakers

one MonoBlock amp for the sub

===============================================

are both setups possible and will both work relatively equal?

i am leaning towards the 3100DVD because one its cheaper, and 2 i like the USB ipod hook up in the front of it.

the only this i like about the 4100DVD(USB ipod hookup in the rear of the head unit) is the 3 preouts really, but im not sure if they are completely necessary for what i want to add in the future.

http://www.crutchfield.com/p_130AVHP....html?tp=20217

i know i want 2 door speakers and 2 rear speakers, but not completey sure about the sub so i kinda want my options open.

thank you for you feedback, help, and support