|"I imagine I will be able to install my current XP OS"|
Well, maybe. OEM disks may or may not work in a newer machine. For the most part your new machine is so new it might require a bit of work just to get it up.. And you do risk borking the Vista install.
If all you want is some features of the old machine then consider a virtual machine to run either an image of the old machine or a clean install from retail xp versions (oem may work). Vmware makes a way to produce a virtual machine of the xp box. Be sure to run NTBACKUP first if you can.
There are a few good virtual machines that would run the xp as fast as your new machine. See Virtual PC and VirtualBox and Vmplayer. All free for personal use. Very easy. They are programs kind of like photoshop or ms works. But they don't do office stuff. They are a software version of a real computer. They run at the same time as Vista. The partition they use is just a file on your vista machine. You can install quite a number of virtual machines in many OS's. (just not mac os yet cause they suck, my personal opinion)
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10