Hi dont know if you solved your heater problems i kind off skipped to the end after reading the first 30 pages
I live in denmark and can only say electricity here cost more pr kw

I have tryid 4 different glass heaters including the jaeger and the most effecient is a cheap chinese stainless steel aquarium heater called choson,its rated 300 w but only pulls around 240 watt according to my power measurer,i bought 5 x 300 watt jaegers and they all pulled around 315-345 watt,the cool /hot thing about it is 2 x 240 watt choson(cheap china unit) gives the same amount off heat as 3 x 300 watt jaeger or any off the other glass types i have tryid,i dont know if the difference is in the heater housing becourse all i have tested have been glass ecxept for the stainless choson,maybe stainless steel is better for transporting heat ?
Due to electric prices here im now working on a kind off floor heating system in my sump powered by the danish fjernvarme that is hot water connected to my house from a public powerstation normally only used for heating off houses,but it only cost 1/3 off electric heating,i have to heat about 850 gallon tank and 300+ gallon sump.
By the way very aquarium you got i looke forward to see more pics and to see what kind off fish you are going to get.