It is hard to say which solution will meet your needs. SuSE has a 2.6 kernel in their distro as has Debian Unstable....
In the near future Linspire will release the new version of their desktop that has SATA support, but for that you need some patience until it is available.
Throughout time support for the disk is common. Furthermore you need to test your distribution very well to ensure that all the hardware of your Dell machine works.
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