Current motherboards and power supplies are setup for SATA connections to the drives. Also current mobos require a second power connection which an older power supply won't have. The "ribbon" cable and the 1.44 floppy have pretty much gone the way of the dinosaur. RAM is motherboard specific.
My last personal build didn't happen. Instead, I purchased an Acer Aspire 7745G laptop with an I7 CPU and a HDMI out for TV as an external monitor. I put a SSD hard drive in it to speed it up. Fits my lifestyle better.
Right now, there is a 40" Panasonic LCD TV going on sale for $199 @ Best Buy Thursday afternoon. Target has one going on sale Thursday afternoon for $119. Either of those will give you the screen space of 4-20" monitors. HDMI hookup.
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