Just thought I'd mention to my Canadian brethren, that the new XPS M1710 is actually cheaper now than the M170 was. It starts at $2499 (Black) with a half-decent config with GTX going for less than $3000 (only a $150 upgrade from the GS to GTX). I suggest grabbing one while you can, as I've noticed that prices for new systems generally start low, then balance out later on (the 9400 is still more expensive than when I bought it back in January).
P.S. The svideo/spdif adapter is also available for the M1710 ($10), which should allow for 5.1 digital output [EDIT]: But not on the US site!!!
[UPDATE]:
Did a few spec comparisons:
All with: 1GB @667, WUXGA, 7900 GTX, 8X DVDRW, 3945 Wifi, Audigy Sound, XPS Backpack, MCE '05
FROM THE CANADA SITE:
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Black M1710: T2400, 80GB 7200, SPDIF adapter, 720 Colour printer, 1YR Warranty = $2814 CAN ($2479 US)
Red M1710: T2500, 100GB 7200, SPDIF adapter, 720 Colour printer, 1YR Warranty = $3164 CAN ($2788 US)
FROM THE US SITE:
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Black M1710: T2400, 80GB 7200, NO SPDIF, NO printer, 1YR at-home Warranty = $3198 US ($3629 CAN)
Red M1710: T2500, 100GB 7200, NO SPDIF, NO printer, 1YR at-home Warranty = $3584 US ($4068 CAN)
So it looks like if you're in the US, buy from that balthazar guy, if you're in Canada, the Dell Site is pretty good!