I may be wrong but I believe AOC are a relative newcomer to the UK market so there's likely to be little information on their product warranty available.
Picking up on a point already raised....TFTs do not support the range of different resolutions that CRTs do. As such the default res on a 17" TFT is usually 1280x1024. They can go a bit lower than this, say 1024 x 768, but they usually lose clarity. This may be an issue if you aren't used to the higher res, though it does mean you get to see almost all of those lovely charts people paste on T2W without needing to scroll :~}. A reasonable CRT/graphics card combination would support anything from 800x600 up to 1600 x 1200 and often more than this.
One other small point is that many TFTs don't have a height adjustment - check if this matters.
Currently running a Philips 170S2 at work which is decent piece of kit.