So my new computer is mostly together now. The remaining programs I'll install as required.
I was having trouble re-lettering one of the drives. For some reason it wouldn't let me from the disk management console. So, edited the registry directly: using this - How to restore the system/boot drive letter in Windows - as a guide. Works now.
The two main things that I've lost from this whole process are: the list of RSS feeds that I subscribed too; and my Firefox bookmarks. The later was getting very clogged up (I hadn't cleaned it out in ages). It was just the list of people's blogs that I ever used it for, and for saving links to interesting articles. Monitor is sorted out - after I got the driver for it (just using the video driver on the motherboard).