Computer build, I have some questions?

[Salmon Trout]

Only you can tell. A 5400 or 5900 rpm drive is not junk by any means. You won't have an unusable or even particularly slow system.

[Cityscape]

So is CoolerMaster okay? I sure hope so because I'm not sure if I could afford anything more pricey. These are my 3 options for a CoolerMaster PSU:
http://www.newegg.ca/Product/Product.aspx?Item=N82E16817171028
http://www.newegg.ca/Product/Product.aspx?Item=N82E16817171031
http://www.newegg.ca/Product/Product.aspx?Item=N82E16817171046
The first 2 are are CoolerMaster eXtreme Power Plus and the last one is a CoolerMaster Elite, which do you think is better?

Are they all compatible with my motherboard (remember, I know very little about PSU's)? And will these power supplies have enough power to power my computer? I couldn't find information anywhere about my much power the Asus graphics card needs.

And thanks a lot guys for helping (that's what I like about CH) me with this!

The power supply is what I need help with most. I don't know much at all about them. Like are these even the right voltage for my PC, i have no clue. Could someone pretty please help me with power supplies?

[Cityscape]

Okay, well I've found out that Maximum PC used this same motherboard (http://www.newegg.ca/Product/Product.aspx?Item=N82E16813128342) and PSU (http://www.newegg.ca/Product/Product.aspx?Item=N82E16817171046&cm_re=cooler_460-_-17-171-046-_-Product) in one of their builds. So that means they must be compatible.

But now I'm thinking about upgrading the motherboard to this (http://www.newegg.ca/Product/Product.aspx?Item=N82E16813128394).

It'll only cost $14 more but will give me several improvements like 16 GB RAM support (instead of 8GB), 4 RAM slots, much faster FSB, extra SATA port and more.

But this motherboard has a 8-pin CPU power connector, the other one had a 4-pin connector. So what I'm wondering is, is the same PSU still compatible?

[patio]

But this motherboard has a 8-pin CPU power connector, the other one had a 4-pin connector. So what I'm wondering is, is the same PSU still compatible?

No.
You will need a PSU with an 8 pin power connector...