To rendering grafis u need more powerfull processors and a big memory & a great VGA card..
This that i can sugeest to you ^_^
Processer : Core i7 2600K because u need a powerfull procesessor..
Put Core i5 2500K add cache 3MB (u really need this) add 0,3MHz speed and Hyper threading and voila it its core i7 2600K ^_^ (over all : core i7 2600K its better 15% than core i5 2500K in raw performance decided which one that u need, consider it by your budget)..
VGA : put Geforce 580/570(minimum) in whatever brand that u choose, why i suggest you GeForce, because in graphic processing u cant depends on manufacture support u also need community support and most of designer use GeForce rather than ATI
Geforce :
PRo : Community base, driver support and partner ship with Adobe inc. Best performance in VGA card..
Cons : in a year they only update they driver twice time, use a lot of electical power..
ATI:
Pro: Driver update monthly, better performance/price, performance/watt...
Cons: Lack of community supprt..
Memory : u can choose, a couple with total of 8/12/16 GB (depends on your budget) PC 1800 DDR-3 on any brands, i suggest y choose which is offer a life time guarantee
Motherboard : choose Z68XP-UD3-iSSD for great performance in caching and ask for Intel Smart Response Technology (ISRT) to be activated while you setup your system..
Chassis : CBM Azza Solano Great ever Price/Performance Chassis..
Power Supply : this is depends on how many VGA that you choose you can ask retailer that near you, (warning : remember this all you CPU parts life n health is depends on this things, take a lot of care on this side..
Hard disk : Choose non ssd, sata hard disk.. dont choose a series with a green title ^_^ to have maximize performance..
Optical Disk : u can choose anything despite of ur need..
Cooling : Choose which one that you like :
Cooler master 212+ or,
Thermaltake Frio OCK (OverClock King) or,
Prolimatech Super Mega(u need to add a couple of fan) or,
Xigmatek HDT 1284.
monitors : choose LED panel with size and how many LED that your need