I meant better brand. The Rosewill brand is terrible.
The Corsair 550VX is solid, as are most PC Power & Cooling PSUs. Check out this list for a good starting point. It's a little outdated, but is still very relevant. Any PSU you choose, try to find some reviews, from anandtech.com, or hardocp.com,
here at Tom's Hardware or another reviewer site. Look for information on stability, heat and noise.
Get a Tier3 or above. One PSU not in the list (it's to new) is the Antec Earthwatts line. The 380W Earthwatts should more than handle a system not using a high-end graphics card. Some reviews even have shown it able to run a single gpu machine reliably. You'll also be helping to save the planet.
For music production I might look into a passively cooled GPU. You won't need the graphics horsepower of a high end card and the reduced noise could be a plus (I'm not sure what your exact usage will be).
If silence is important to you, you might also try the Antec Sonata III 500 case which is very quiet (with 2x120mm fans set to low) and comes with an Antec 500W Earthwatts which should be more than enough for a system like yours.
Also, though your results may vary, I didn't like the Samsung 2253BW. At stock settings compared to a 206BW and 226BW the monitor was a bit washed out and the colors were VERY blue. After hours of adjusting it by eye I was forced to compromise between red-shifted color and a proper white point and a blue-shifted white point but relatively accurate color.
^ He brought up a good point. I'm so used to machines built for gaming, I overlooked that you said the machine was for music production. If you don't plan to do any gaming, you might want to consider getting a 780G motherboard like this Gigabyte GA-MA78GM-S2H (which has the best onboard graphics to date) and forego the discrete GPU.
The Sonata III as stated above would be another good way to eliminate possible audio interference.
I was considering the Gigabyte GA-MA78GM-S2H to begin with. I went to an Acer AL2216Wbd Black 22" 5ms Widescreen LCD Monitor (tons of good reviews on it).
I guess clarifying my use would help...
I currently have a Boss BR1600 16 track digital recorder and want to upgrade for more editing power/VST/track options. (Roland recently discontinued their flagship 2480 line).Steinberg Cubase 4 is the recording platform. Quiet is a big plus. The program needs a good amount of horsepower to run optimally with high track counts, 2.4 GHz quad-core + 8GB RAM should cover that.