I hate to break it to you but the Thermaltake TR2-430 is more or less crap. But I suppose it is better crap than your old crappier power supply. If I remember correctly, the capacitors (by Fujihuyu I believe) used are of less than average quality.
The problem with your current system is that your P4 530 @ 3.0GHz is extremely power hungry. When under load (playing a game or doing anything stressful) it can consume 135w - 140w of power. That is a lot of power.
If you are going to upgrade your system soon I think your power supply can handle up to a Radeon HD 5770 / HD 6770 (basically same graphic core, with minor tweaks to the card which does not affect performance). You can buy one for $90 after rebate:http://www.newegg.com/Product/Product.aspx?Item=N82E16814102873
Here's benchmarks for the Radeon HD 5770:http://www.techpowerup.com/reviews/Powercolor/HD_6670/6.html