from my experience of acronis and norton and powerquest - i'd go for paragon. that's what i use and it's as a result of using the others.
Is Exact Image a stripped down version of Drive Backup? Or is Drive Backup the new Exact Image?
Are they still developing their products?
Do you know how much it will compress? For eg. 2.3gb?
Imaging and Disk Copying are 2 different things.
Imaging a hard drive allows you to create a compressed image archive file(s) that you can copy/burn on another storage media. In order to use it you have to restore the image to a hard drive. Think of this as keeping a "snapshot state" of your hard drive at a particular point in time. I think this what Paragon Exact Image does.
Disk Copying a hard drive allows you to do a sector for sector copy of that drive directly to another drive. No intermediate images or reinstallations necessary as you can just put the copied to drive in your machine and boot up from it. Typically this is used if you want clone a hard drive or upgrade your hard drive. Think of this as a "hot swap" cloned copy. I think this is what Paragon Drive Copy does.
Acronis True Image, and I think Norton Ghost, has both of these features integrated into one software package. BootItNG and Image For Windows only support the imaging features.
Personally I use True Image and BootItNG depending on my needs and particularly they both have support for running off a bootable CD.
Paragon's offerings segments the features so you only buy what you need:
Exact Image - imaging
Drive Copy - disk copying
Drive Backup - both imaging and disk copying
Hard Disk Manager - both imaging and disk copying and partition management
Given this deal, for personal use, it's worth to download BOTH software (Exact Image and Drive Copy) to try them out. From Paragon's website, I see that they both have some support for building a bootable cd to run their software, but I don't know if features have been stripped out for these "Special Editions".