Good choice Rob, which one are you opting for? Sorry to say I've no experience on that lens, but I am sure you will be very happy with the camera.
After much sole seraching, visiting the three photo shops on a regular basis at lunch (had to start thinking about a disguise at one point!) and considering all the options, I have plumped for the Canon 400d (xti).
Have also ordered a 18-50 sigma (had better reviews than the kit lense) and Canon 70-300 usm IS. Will also order a canon 50mm 1.8 prime.
A big thanks to all the advice and to this forum. For those interested my rationale for the canon was
a) Good pedigree and the 400d gets great reviews
b) Seemed a good budget start to DSLR world whilst I learnt 'the trade'
c) reasonable light for carting around with the rest of the family stuff on days out
d) lense dust was more of a concern than having IS in body (but only just!)
e) I did compromise here because the D80 and K10d felt better in hand however the Canon did not feel bad and perhaps comparing to these two models is a bit unfair.
f) General advice was to save a bit of money on the body and spend more cash on lense (hence decent zoom)
g) a good freind also has Canon (35mm film)
h) good selection of lenses
As I say in being fair I have a Panasonic Camcorder (3 ccd), Nikon PnS, Pentax 35mm compact and when it arrives a Canon
thanks again folks and may I say this is such a friendly forum
Rob