Looking for input on sound systems

[KyleSeal]

Getting to the point where I need to think about stereo and sound system.

Heres what Im thinking about doing. Ill probably get a radio from ClassicParts.com, one of the stock looking types with blu-tooth and aux capabilities. I'm thinking about getting a set of monospeakers for the stock dash location from Brothers, are those of good quality?

I'm also probably going to put a box behind the seat with some smaller sized subs, will the radio I'm looking at handle this?

Any suggestions on my setup ideas? I've never done a sound system before but I know I can with the right direction.