Your ram is DDR400 Im assuming correct?
I'd relax those timings a bit. Try 4-4-4-8 It will save you some hassle of figuring out what hardware cuased a BSOD and why.
I'd start out 1.45 Voltage like you have, that's a comfortable tempeture.
Excellent to see you have a good motherboard.
So what I would do is first download some utilites that you will need that will come in handy. I usually make a folder for these types of programs and stick it on my desktop so I know where everything is
CPU-Z Probably one of the more important tools. You know what it does.
Smart Guardian Temepture monitoring Scroll down and look for Smart I/O Driver. The reason you need this over other temepture monitors is becuase this is most accuarate and specially made for NF4 Chipsets like yours
Super Pi Mod You dont need this but it's a fun tool, and usefull for testing ram stability at 32M
You really shouldn't go above 1.55 if you plan on using your overclock 24/7. I assume your on air so 1.5 or 1.55 If your tolerant of your temps.
You might even want to get a new CPU cooler. I'm not sure what you have now, but it could help you get that extra 200 MHz
You might want to invest in a new chipset cooler. This is optional, but is cheap and keeps your north bridge nice and cool.
You should never use windows to overclock A64's. Always stick to the BIOS, so just incase you get instability and looping, you can always clear you CMOS.
This is your new mantra
That guide will teach you alot of the vocabulary and such.
I hope I got everything.