I put together what seems to me to be a reasonable box. $1457.62:
Mobile Athlon 64 3000+
512 MB RAM
60 GB 7200 RPM HD
XPPro
1 Year Express Tech Support
Leaving out XPP would save $142.03 I would have some form of Windows available for it so that you would be sure you had a working box if you had some problems getting parts of it working with Linux.
You might want to look around at [link|http://froogle.google.com|Froogle] to see what other "Athlon 64 mobile" PCs are out there. E.g. there's [link|http://www.newegg.com/app/viewproductdesc.asp?submit=Go&DEPA=0&CMP=OTC-Froogle&description=N82E16834224014|this] one at Newegg. 3400+, 1 GB RAM, 80 GB 5400 rpm, XPPro. The other specs make it sound like the same laptop. $1599, but it's out of stock.
In short, the Adamant machine looks OK but probably a little overpriced unless you get a really stripped-down version.
HTH.
Cheers,
Scott.