I fitted myself an Alpine IVA-W200-RI just recently as I've always liked Alpine headunits and even though I had a top spec single DIN unit from my last car I wanted to fit I thought it was such a shame to waste that lovely Double DIN openeing in the dash.
I think having a monitor in there adds a real nice touch to the interior with the added bonus you can stick a DVD on if you ever fancy it!!
Also went for a top of the range set of Infinity components, the kappa perfect 6.1's as again, I've always rated their speakers. Although it did take a bit of cutting to get them to fit, so maybe worth goin for a slightly small er speaker size (5.5" rather than 6.5")
Fitted a small 2 channel Infinity amp hidden under the passenger seat and it really is a beautiful set up. Plenty enough bass so you have no need or desire for heavy amps & subs, and real sweet clarity of sound. Not sure what kind of music you like but I've noticed that the infinity's work better with higher pitched vocals than anythin else, but man, do they sound good.
Anyways, I've attached a pic of the head unit, but will get some pics of it installed in the dash this weekend. And just incase you wanted some rough prices for a similar spec:
W200-RI £400
Kappa Perfect 6.1's £200
7251 2ch Amp £100
Not cheap, but IMO, real good quality kit.. Hope that helps some mate, keep an eye out for the pics this weekend
and a quick edit, I dont even have the rears pushin any sound, I've never rated 6x9" as a good speaker. Get some good components and you wont need em!!