Quite frankly, if you're putting together a new computer, you can probably find friends/family with parts laying around that are this good. A $250 laptop with a T4500 would be more powerful and a P6100 laptop would beat that.
DO NOT BUILD WITH A PENTIUM D UNLESS IT'S FREE.
Otherwise, the Pentium Build you listed, but with a Core 2 Duo CPU instead (like an E6600) could be just fine.
Btw, 8GB of RAM is pretty much useless for most tasks. Don't get it unless you know specifically what it's for.
If you give us your budget and purpose, we'll give you a full list of parts that give you the best bang for your buck.