You should check the form factor of the Motherboard you are wanting to purchase and make sure your PC Case will ccept it
MB form factors: Pico-ITX, Mini-ITX, Micro-ATX, ATX, and Extended-ATX
just about every mid size PC case ( Tower ) will acept Micro ATX, ATX and Extended ATX
and I am personally of the opinion that bigger is better when talking about PC Cases...... more room for air to circulate and move around...... although their are some PC Cases that are BIG and take up alot of space.....
as for PSU's ...... your PSU is only going to draw the watts that each component is pulling ( drawing ) power...... just because your PSU might put out 1,000 watts doesn't mean that it will be putting that out 100% of the time, it will fluctuate... at start p it might rise up to close to max output but once the PC is up and running it will fall off to pull just what the PC components are demandingwith a slight overhead............ if you use every single plug your PSU has to offer ( highly doubtful ) ...... then you might come close to maxing out your PSU
also in some instances one might use more power if they set their OS up to where some PC components are not allowed to go idle or into standby mode or hibernation..... with that said, for those using windows 7 OS, itis recommended to not use the hibernation or standby modes or such.......
now you posted that you have a 5570 at 2048 shadows and can run aces high maxed out........ yes that is good.....but the looks of the graphics from a 5570 compared to the looks of the graphics from say a 6950 or a 5870 or even a Nvidia 560 would look far more superior to what you can see with your 5570 .......... due to more shaders , better clock speed, more ram , better ram etc...... ( am not trying to put down your 5570, just trying to let you know their is a big differencein what the graphics look like )
I can shut the heat off in my bedroom and open the window when it is 40 deg F outside and my i7-2600K along with my ASUS 27" monitor will keep me more than satidfied temperature wise........ but my temps are all very low cpu runs around 37 C, VC runs around 34 C, inside case runs around 31C when loading ( maxing) the PC
yes the higher performance the more power to a point....... if you watch your power bill ( elctric bill ) you can actually tell when an extra pc is added or an extra TV ........ but then again my background includes energy audits......
I am not partial to buying Intel or AMD....... I like them both........ only thing is AMD is cheaper...... I am partial to using ASUS, Corsair, thermaltake cases/fans/ power supplys.....
if you can afford it, I can highly recommend the Thermaltake Level10 GT Case ....... but it is expensive
anyways, good Luck on your venture, titanic
TC