The HU looks like a 4950 not sure though. If it is a 4950, you might be able to find better prices. Good HU though. Bought mine last March for around 5900.

No comment on lanzar as I have not seen or heard them play. Personally, I will skip the rear speakers and use the money to buy better front speakers. The music must come from the front. Imagine yourself in a concert, the musicians and sound is in front of you, not behind. When you have some more money, you can get a sub.

The amp looks like its a 2 channel amp. I would prefer a 4 channel amp, that way I'm ready for the sub. If it really puts out 800 watts, it will kill your speakers. Try to match your amps output to your speakers power handling capability.