Bought a Dell Latitude C600 - the one with the ESS Maestro 3i and the ATi Rage Mobility 128 graphics.
Bonus: It's a Mobility M4 with 16MB of embedded DRAM.
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Downside: the vendor shipped the machine with 2 batteries and NO optical drive. Had to use a Y-Cable and my USB2-to-Cardbus adapter along with the Liteon DVD burner to install stuff, and since it's USB based, I can't test the DOS/mscdex based stuff yet, but the C-bay DVD/CDRW combo drive will arrive next week, along with an mSATA SSD for the machine.
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The Mobility M4 runs quite well in 16 bit mode (spanking the Thinkpad T21 by about 40% in most apps), but inexplicably poor in 32 bit mode (The SavageIX/8 in the Thinkpad is surprisingly performant in 32 Bit mode). Here it is running NHL99.
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Going to do a full review comparing it with the T21 (also 850MHz) and my Pismo G4/555MHz. And yes, there will be audio samples off DOS mode. Look out for it later this week.