Ubuntu Installation :: Creating An ISO And Reinstalling - Transfer The Software And Packages That's Already Installed

I want to transfer the software and packages that's already installed. I have an ISO disc creator to take the current information on my hard disk and format it for an ISO, which I can burn onto a DVD, but what I'm wondering is, how would I go about reinstalling the OS

here's the backstory, I'm wanting to transfer the hard drive from this computer to the one I'm going to custom build once it's finished, and I'm pretty sure I would have to reinstall due to the fact that I would have to reconfigure and install new hardware drivers. If I'm wrong, please tell me so I don't waste the time and go through the trouble of this

my plan is to create an ISO of my hard disk, then backup all of my personal files, then remove them so the ISO will have more room (and I may get rid of some unnecessary packages), then get rid of everything on the hard drive (just use a livedisc of something and use a partition manager to delete all partitions on the hard drive) then move the hard drive over to the new computer, and reinstall with the ISO disc I created

the things that will be staying the same is the graphics card, some peripherals (like monitors, keyboard, wacom tablet, printer, etc...) but the motherboard has a different sound card and a different processor (I'll probably just install a different kernel to accommodate for that) and some different things that are smaller (don't forget the power supply)

offer a better method of transferring the hard drive (and don't say "just simply take the hard drive out and put it in the other computer" unless you have indisputable proof that it will work. I know it most likely won't work for multiple reasons, the drivers being one of them, the fact that windows can't do that (I have a different plan for windows that involves upgrading from vista 32bit to windows 7 64 bit))