Those look great, Rich. I've always been a fan of Cobalt Aquatics' stuff ever since I purchase their MJ pumps. What I really like are the slim profile, especially because my heater since in my 20L. However, I can't really argue with the performance of the Eheim Jagers.I am really liking these heaters
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=25144
Slim, good longevity (so far), and unbreakable plastic - plus really easy to use.
That said, my DT is getting down to 75 at night and 78/79 during the day. Not worried.