I go to both the April and Oct Canton Fair each year. God i hate that trade show..... but only cos ive been doing the trade shows for 2 weeks already by the time i get there, and the thing is just sooooo HUGE.
if price is no object.... i highly recommend the Shangri-La, Guangzhou.
It's a short walk from the hotel to the fair, and its really nice. COmfort is paramount to me.
Of course... my work pays for me to stay there, so im happy with the price.
Around Canton Fair time, the price hikes up to around RMB2700-3000 a night.
I fly Cathay Pacific to HK, and then catch the train from HK to Guangzhou.
The train is cheap, and cos its only a relatively short distance, will be faster than flying into GZ (cos you will have to stop in HK anyway).
Cathay is good, cos they (usually) have the individual on-demand screens in the back of each seat in economy. Price will be around $1400 return.
Ive been looking at prices myself to possibly fly my fiancee over with me in April, so she can get to stay in the HK Grand Hyatt with me for free and get to taste all the wonderful food in HK as a cheap little holiday..... Singapore airlines are a little cheaper at around $1200/return. Dont know what the fitout of the planes is like though.