The 450W Corair HX is undoubtedly a good PSU, though for your budget the VX or the PC Power & cooling 420 would be a better choice. However, if you have your heart set on the HX 450W then you will be getting a good PSU. Also, any of those PSUs will be barely tested by the PC specifications suggested above, you could happily add a mid-range graphics card to it later and it will still run fine - even the 420W will be grand.
There is nothing wrong with the samsung T220. It is simply a bog standard TN panel monitor, no more no less - It will likely suit you fine for your applications.
However, I specified the more expensive Dell 2209WA for a couple of reasons:
-It uses an eIPS panel which is far higer quality than a TN (such as the T220) so it has much better image quality and viewing angles
-For your applications I judged that you would benefit more from a better monitor than a better CPU (as for the applications you allude to, such an upgrade will not give you much (if any) extra performance).
-Dell warranty is simply brilliant, if you have a problem with the monitor then dell come around the next day with a replacement monitor and exchange it on your doorstep - so you are never without a monitor.
Here is a good website that details the difference between the monitor panel types, the uses a version of IPS, the samsung uses a TN+ panel.