Nikon compacts are worse than Fuji’s!!! I work in Jessops and 90% of the time a Canon compact will kick the ass off any of the compacts. The only ones that seem to come similar are top end Sony’s, like the W270/290. Alternatively, Panasonics are not bad but their ultra wide angle lenses can cause lots of distortion and they arnt sharp in the corners. Very easy to use, great looking, slightly noisier than Canons in low light but nothing amazingly bad.Image stabilization is very good on Panasonics.
The Ixus 90 is an old camera now. Go for something like the Ixus 85 I.S. (or if you can get hold of it, the Ixus 82, EXACTLY the same but in Jessops blue and exclusive to Jessops, and £20 cheaper)
Alternatively, the new Ixus 100 is a lovely little camera, but expensive. 720 unlimited HD video recording that is actually pretty good and looks amazing.
As Geforce Junky says, the lenses are the weak parts, so just make sure it dosent get covered in sand/chocolate/whatever and its not knocked, and itll carry on. I see alot of it happening to the earlier Ixuses but not the latter ones.