I would check to see if they are an HP authorized store; if you are concerned about warranty issues. Also, eCost is part of the zones.com group (Maczone, PCzone) so they are likely to get a significant number of units to sell at first. Whereas Datavision may not get so many up front or as soon as the larger companies. Anyway, just a thought. I would bet HP will have plenty available when the time comes.
As a last thought, if you had order problems, I know the Zones folks are pretty good with customer service; not sure about Datavision. Maybe bizrate.com has some info on them?
In fact, look here:
http://www.bizrate.com/ratings_guide...id--28517.html
Looks like they got 50% happy, 25% neutral, and 25% unhappy with a below average customer service record... That is with 500 reviewers.
eCost has 50,000+ reviewers and 90% happy, 4% neutral, 6% negative.
I think the few bucks savings is not worth a possible nightmare purchase... IMHO