Veilside r33 recommended Focal speakers and I would have to say I definately agree with him there. Alpine speakers, unless you're buying their top of the line stuff are generally quite average. Focal are unbelievable, especially for the price, and mine sound easily twice as good as my friends alpine typer splits. I also like Boston Rallys and JL audio speakers.
Alpine amps are good, but my money would be on an Eclipse amp. If you're hell bent on Alpine however they are a good amp choice nonetheless.
With the headunit, I like Eclipse or Clarion (I have the clarion dxz746mp). Alpine are also good but for SQ the other two are the picks.
Oh and sound deaden your door. I was quoted about $300 bucks for for them to do both front doors so at $150 a door its affordable. It'll make your midbass much better and stop road noise affecting your tweeter's detail.
With subs, I'd go Pioneer (or DLS)! My friend's alpine type r sub sounds shithouse compared to his brothers (much) cheaper Rockford sub (which I though was shithouse before he bought the pioneer class d to power it), and if you read a lot of local car mags Pioneer subs tend to come first in the SQ marks. Pioneer's sound good when you give them a lot of power to play with, and that includes their $250 subs and upwards. They sell ready made subs in boxes too, the amp for a sub tends to be more important imo. DLS are good but generally more expensive and hard to source.
Oh and make sure a reputable shop does the fitting. Proper installation makes a big difference. Don't let your 'mate who knows how to do it' touch anything!
my 2c, hope it helps