I do not think they make Celeron chips without on board processing anymore but you might want to check seeing as how your getting ready to shove a ton of math functions through it.
This was a big issue about 6 yrs ago or so... They made a lot of internet pc systems that were great for surfing but would choke on programs using a lot of calculations.
As for Dell - nice PC's.
Oh - heres a nifty offtopic link for anyone that wants to spiffy up there system
www.glowire.com c'mon lets see some neon'ed up routers now!