The ATI 3450 is underpowered, and OpenGL support (Poser 6 and higher can use OpenGL for the document window) is dismal.
If you're shopping for a Poser PC, I'd suggest the following:

CPU: Intel Q6600. About the same performance as the 8200, but significantly cheaper
Mainboard: Gigabyte P43 series. Very reliable, and more than enough possibilities for expansion. Doesn't come with IEEE1394/Firewire though, but if you're not planning to transfer data between a DV camera and the PC, you won't miss it.
RAM: 4 x 2 GB DDR2-800. Kingston ValueRAM is affordable and works just fine. No use buying extremely fast RAM at extreme prices, it'll get you a 2%-3% performance increase at most.
Graphics card: nVidia 8800GT. Much, much faster than the ATI, good OpenGL support for all Windows flavors, plus Linux. And pretty affordable too.
PSU: Coolermaster M520. Affordable, stable, efficient and silent. Plus cable management: you only install the internal cables that you actually use.
Hard disk: Samsung Spinpoint F series: Fast, silent, and affordable. I have 3 750GB Spinpoints and 2 1TB Spinpoints, and they do their job very well.
DVD: Doesn't matter all that much, LG, Samsung and Nec/Optiarc are about the same price and the same performance. Do buy a SATA DVD +/- RW drive though: then you won't need the large airflow-obstructing IDE cable.
System case: that's more difficult. You'll want a case with room for expansion, a case that is solidly built, a case that has good airflow, and that is silent. Chieftec cases are about the most solid I've ever encountered - sturdy enough to use as a stool! - but they're not exactly silent. The Antec P182 is probably the best compromise.

The total price of the system will probably be somewhat more than the $750 of the Dell, but not that much. And you'll have a machine that vastly outperforms the Dell.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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