All SIFU here, HELP

Hi, I'm a Newbie in ICE. Recently just thinking to upgrade my car audio system. Just few question.
1) I want to concerntrate on Mid Bass. Shu I use 2ch Amp or 4ch Amp?
Actually I thinking to use 2ch Amp for my Mid and 2ch Amp for my
SUB. Or do you think 4ch is enuff?
2) Soundstream brand ok? According to my budget. Or is there any
recommended 2nd brand selling?
3) For HU unit, which model better targeting pioneer or alphine?

Cheers

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Added on September 9, 2009, 12:10 pmOr maybe I shu ask:
Everything in my car now is stock HU, Speakers ...etc
Now, shu I change Component Sets first or the HU first?
because I saw some one in the forum is selling FOCAL component set.

Anywhere,
My Idea of my ICE:
HU: Alpine Single Din or Kenwood Dual Din
Component Sets Front: FOCAL or Soundstream
Rear Speakers: Ori
AMP: ??? no idea
SUB: ??? no idea

Pls advice me. Thanks.

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Added on September 9, 2009, 12:11 pmI normally listen to R&B and Chinese Songs.

This post has been edited by teck333: Sep 9 2009, 12:11 PM

Budget around 2k