You really should try and get a sense of what direction you want to go and what you like. But since you asked for opinions... here's mine.
And I'll try it again since it worked well earlier today...
If you were me and were starting from scratch (as you are), you would buy Wetsounds XS650 boat speakers, Wetsounds Pro 60's or Pro 80's (if you decide on Pro Audio, that is), and "guinea-pig" the new Wetsounds XS12 sub (they are brand new and there are no reviews online, hence the guinea-pig verb). Would cost you about $1600-$1800 for good quality stuff.
And now for the... If I were you, I'd find a reputable stereo shop, show them what you just bought, and ask for their recommendations. Or if you decide to install yourself, wait for Grant to chime in here!