Yeah he is saying you should build your own. You would probably get higher quality parts (case/mobo/psu) and be able to pick out things specific to your needs.
Also, DDR2 and DDR3 doesn't show much of a difference in most tasks, but its still a good thing to have. Not something that is required or worth paying an extra $100 for though.
If you aren't gaming or doing video encoding or anything CPU intensive, other than multitasking, you should be fine on a slower phenom quad tbh. A newer Athlon II quad would probably be more efficient, a little faster, and maybe cheaper though if you went custom or find a build with one.