I wouldn't use any laptop with a 5400 rpm drive.
This is comparable to your selections but, cheaper, customizeable and has 7200 rpm drivehttp://www.lpc-digital.com/sager-np6165.html
Tho Id spend a bit more and upgrade to this one w/ 660Mhttp://www.lpc-digital.com/sager-np6350.html
I'd note that neither Lenovo nor Sony actually "make a laptop". Sony is made by Quanta, Lenovo buys from Quanta, Compal, Wistron and Inventec.
Clevo is sold direct through distributors, read more here:http://forum.notebookreview.com/sager-clevo/91510-clevo-guide-v2-0-faq-reseller-info.html
CLEVO is a large Taiwanese computer company specializing in laptops. While the Clevo brand name is perhaps not widely known, their products are re-branded and sold by known boutique brand OEMs (Original Equipment Manufacturers)… notably Sager, VoodooPC, Falcon Northwest, Eurocom, etc. They are also considered (by whoever knows about notebooks) to design and manufacturer the best of the best notebooks in terms of superior build quality and innovative designs.