1. There is a comparative review on many online review sites, such as dpreview.
2. In general, the H5 outperforms the S3IS. The main benefit of the S3IS is the tilting LCD.
3. Don't buy it at the PC show. The H7 and H9 are coming out already.
4. If you want to save money, buy an H1/H2/H5 off the marketplace section.
ya i heard of the H7/H9 but no idea when it will be in singapore.... also heard of the S4IS, but then again, no idea when it will be hitting the shores!