http://www.newcastleprosound.com.au
Click on page one it is a PDF file, so yeah but still have a look, and check out the Clarion Double Sub Pack.
It contains (for those lazy)
WMA/MP3/CD Receiver and music catcher (head unit, though i may keep my Pioneer one in)
180W 2-way speakers
200W component speakers
Amplifier
2x600W subs in box

All i'm after is some decent sound, that will slay the stock stereo, as i want some decent sound and a little bit of bass.
So would this system be worth it since it is on sale so cheaply? ($748 meant to be double that)

for the price yes, buy buy buy if tuned properly this system would sound quite lovely. btw clarions catcher hu's r awsome to play with anyway hehe

Sweet mate thats what i was looking at. Over time, id ofcourse upgrade a few things here and there, but it would be a good starting system especially for the price.

Another question to add would it be better to have that head unit that comes with the package or keep my pioneer one (model DEH-1650)?

Yeah but still do the other basics. Like decent wiring and sound deadening.

Thats pretty good for that price - i would then buy another amp to run the speakers and that would be some nice sounding equipment

If you were getting a cheap system and worried about the spending i doubt ya gonna need to worry about spending for sound deadening....and wiring is another i wouldnt fork out too much for.

Most ppl generally only buy the $100 wiring kits anyways...which this package says includes wiring...so id gather it would be one of these kits (if it is indeed all wiring supplied) there throwing in for almost there cost price.

Also for the cheap gear as really this is what it is...sound deadening isnt gonna improve it much at all....if tuned properly this would make anice everyday cruising stereo...so yeh its worth the money...and at that price i'd take the whole back and sell your current HU unless it heaps better and then just install it...and sell the clarion on...even if only for $80 or something.....