Are you trying to buy from someone on here or just need advice on where to go? My fiancé and I just ordered a new heater for my fowlr tank from drs foster and smith. They come cheap on there for a good heater that will last. They do free shipping a lot of times too.
I use a 500w jbj titanium heater with controller and it works great. I used to have hydor inline heaters and they were good but after a year they started to cause the impeller covers on my fluvals to pop off which allowed the impellers to dislodge. If you're on a budget the eheim is good, but they may be the ugliest heater ever made.