Well, you should have all the wires you need. All the parts should come with them. I would make sure to have some extra screws though. Oh, and you want to make sure that if any of your parts are "OEM" that they do come with wires and such. I was looking at hard drives the other day and it said OEM parts don't come with all the wires and screws needed.
<font size=1><b>Current Build:</b>
DFI Lanparty Ultra-D
<a href=\"http://valid.x86-secret.com/show_oc?id=77714\">AMD 64 X2 4400+ @ 2.20GHz</a>
Big Typhoon Heatsink/Fan
2 GB G.Skill DDR500 PC4000
eVGA 256MB 7800GTX
2x 120GB Hard Drives</font>