Overclocking isn't a walk in the park, but don't let the naysayers dissuade you from trying. I think you had a great idea when you said you were going to wait until you had a new system before overclocking the old one. I have done the same with several computers at my disposal, with mixed results. In most cases, I have not risked OC'ing a computer that I rely on or that is central to my work.
That said, you should definitely try overclocking your AMD 3200+, and maybe even your memory and video card. Programs to start with if your bios isn't very supportive:
CPU: SetFSB
Memory: Memset
Video card: Nvidia System Tools
There is a ton of information out there on this stuff if you just go looking for it, so make sure you've done your research before you dive in. And be warned, overclocking is addictive. Even though 15% is the supposed safe zone for hardware, you will probably want to overclock more. I suggest overclocking with a goal so you don't go too far. You could pick a game like Crysis for example, and set a goal to reach 3 fps higher.
Another quick tip from experience, make sure the inside is well ventilated. Keep all your fans and heatsinks COMPLETELY free from dust particles. Dust buildup contains the heat that is supposed to be escaping the fans and heatsink, which can potentially overheat and fry your components. Also, make sure you ground yourself to something before touching any components.
Have fun and good luck.