You're correct in that I'm looking for something more multi purpose. I'll probably be going for the Lenovo, not because the Rain wouldn't work as a day to day laptop but because the Lenovo has the option of a higher res screen, 1600x900 as opposed to the Rain's 1366x768.
It's a shame about the Rain not having a higher res screen because, after all is said and done it is the cheaper of the two, it's all set up ready to go and judging by how helpful the person was I talked to on the phone they've got better after sales support too.
Do be careful - buying a PC laptop for audio purposes can be a minefield, and you may find that the change in screen resolution is the least of your worries with a mainstream Lenovo.
Have a read of this article by Robin Vincent (from Rain Recording UK) in which he describes how he shortlisted five mainstream laptop models for his new range, and the various problems he encountered with them:
The final model used by Rain was indeed a Lenovo Thinkpad, but (like nearly every other current specialist audio laptop model) it has a custom BIOS with extra features that allow audio performance to be significantly streamlined - none of the mainstream models have these options