@baitban: You would be very happy with fixed frequenzy in your depths, so the HDS Touch would do just fine.
@Riba: If your friend can't use his Elite HDI deeper then 30 meter he is doing something wrong. I bought Elite 4 HDI for my canoe, and it tracks bottom down to 400+ meters in freshwater using 83/200/455/800-HDI. Offcourse you will not see fish at those depths, but that has more to do with the ducer then the sonar itself. In fact the sonar in Elite HDI is exactly the same as in your HDS Gen 1, but with more limited menus for adjustment.
The difference in CHIRP-sonar is just like fixed frequenzy, it varies between the brands and the ducer used. Raymarine Dragonfly and Lowrance Elite CHIRP both use the OEM-ducers for CHIRP, and will never get even close to the capabilities of systems that use Airmars ducers. I just wrote a test of Elite 5 CHIRP for a Norwegian site, and have spent around 40 hours with it over the last months in both fresh- and saltwater. It is a very good unit for it's pricepoint, but it is not magic. :)