PCs That Can Be Managed From a Serial Port?

PoochieReds asks: "I'm in the market for a couple of PC's that are manageable via serial port. Where can I find a PC that doesnt take a keyboard and monitor to set up the BIOS? I'm really looking to go x86 linux for this job, but if I can't find something that does what I need I may have to fall back to using a SPARC. I'm also not interested in the RealWeasel -- neat product, but I really want an integrated solution (i.e. a serial capable BIOS). Can anyone recommend a reliable, rackmountable, x86 box that is completely manageable via serial port?"