I've just raided two seagates in my dell - got a cheap raid card and bought another seagate 300gb onto my 160 i bought at the beginning of the year. Easy as pie mate, just have to figure out whether your board supports SATA. It will probably have an IDE cable anyway, so that's always a safe bet.
My dell is an old one, had an IBM deathstar in it that lived for 5 years of almost constant use, which was quite nice. I'm never buying a dell again though, there's a design flaw in my case which means that two drives create too much vibration weight so that you get a lovely and irritating noise >_< I've had to foam up the drives and the supports, seems to have worked.
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