Speaker and Head Unit Recommendations

[Chim450]

There are a couple of discussions going on at the moment regarding stereo set ups. I have decided to upgrade my standard setup to something a bit more audio-visually appealing.
I plan on changing the rear speakers to something better (I have the factory fitted pioneers at the moment) adding some front tweeters and possibly a sub unit. I have an aftermarket pioneer MP3/CD head unit which is starting to play up.
What recommendations do you have regarding replacing the rear speakers (ideally a straight swop). Recommendations for front tweeters and sub base unit?
As regards the head unit, I have been toying with the idea of getting a Parrot Asteroid, mainly for bluetooth handsfree and decent amplification but with the added bonus of android apps (although there does seem to be a paucity of decent apps for this unit), any other decent head units out there £200 ish?

[Macey]

I've just upgraded my head unit to this,

http://www.amazon.co.uk/Kenwood-KIV-700-Advanced-D...

It does not play CD's but all of my music is on my iPhone which now plays through the stereo, you can get a bluetooth module as well. The only downside to this unit is that the front face does not come off for security.

[Robertjp]

Another suggestion would be the Alpine x305s...can see it on my thread, parrot add on available i think.

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

TBH though 'decent amplification' isnt typical from the HU alone, and from the work i have done you need something pretty beefy to get decent sound in such an inherently noisy car as the tuscan

[dvs_dave]

The HU amps are perfectly fine for running 4 small speakers/tweeters above 120Hz. It's the bass that needs the quality big power. An amplified sub unit will provide all you need in one easy to install unit.