Need home audio advice

Looking for some advice on a system that I'm about to purchase. I want to spend somewhere around the $10-$13k range on equipment. I would say that it would be used 40% for Apple TV, CD's etc, 55% just general TV and MAYBE 5% of the time watching movies. I have settled on some products but am clueless on others. And I'm more of a Hip Hop kind of listener so it would be more important to me that the sub be tight and more for music than for movies. Another thing is that I prefer all the speakers to be flush ceiling mount, sub excluded due to the fact that I live in a older remodeled house with 8ft ceilings. And I'm going to have everything hidden in a dedicated closet so im assuming I'm going to need some sort of IR device? Thanks and I'd appreciate your advice.

/ Represents walls
- represents glass or french doors
__________ represents a foot drop in floor and ceiling in the living room and a change from hard woods to carpet.

Diagram is pretty proprtionate to the actual room sizes. About 900sq ft total (K-250, D-350, L-200)

/-------------//////////////////////////////////
/..................................................-
/.....................KITCHEN...........-
/...............................////////////////////
/..................................................-
/........................DINING............-
/..................................................-
/..........._________________-
/..................................................-
/.........../...........LIVING 5.1........-
/.........../......................................-
/...........//////--------------------------
/--------/

The TV will be centered on the wall in the living room by the L in LIVING 5.1

AUDIO CLOSET

Receiver - Denon AVR-3808CI
Blueray - Samsung BD-P1500
Apple TV
Power conditioner - not sure what kind

LIVING ROOM

TV - SAMSUNG LN52A750 LCD TV
Front & rear & center speakers - Speakercraft AIM8 Three (5)
Sub - Speakercraft, Velodyne, etc I'm open. Don't really know what subs work best with Hip hop, top 40 etc. Just looking for tight bass.

DINING ROOM/KITCHEN

Speakercraft AIM8 Three (4)

BACKYARD/POOL

Speakercraft OE8 three (2)

A few other questions I have:

1. Is the receiver powerful enought to run all speakers at once or would I need an additional amp. Don't want any clipping at medium+ volume.

2. And is there and Iphone app that anyone knows of that I could use my Iphone as a universal remote.

3. Should I opt for the Denon 4308Ci for the Wifi if I want to use my iphone as the remote?

4. I see a big price difference between the HDMI cables. Is there really a difference.

Thanks in advance and I appreciate all your feedback.