Need components for RetroSound

[blackhawck]

Trying to get some sound into my 71. It still has the tank behind the seat and I don't have plans to move it at this point. I'm just looking for a decent system not show quality. I have purchased a used RetroSound Laguna and am looking for advice on what to pair with it.
I'm thinking 6x9's in the doors (already cut) and maybe pair two 4" speakers in the dash.
I would like to add an amp and maybe sub under the seat.
Can anyone recommend some decent components speakers/amp/sub that won't break the bank and any other installation or set-up ideas.

Thanks