The Modern Alto is pretty expensive in its own right, although less than the Eagle. Seems to depend on the type of wood you chose (grenadilla with E-foot is about $1700).
On Thomann.de, the Rosewood one with F foot is about 900€. The price difference to add a single semitone in the low register is not justified in my opinion. That low E is not even used in any traditional recorder music.
In any case, these modern recorders cost as much as three or four good quality alto/soprano, so I would only consider them if I am sure that playing in a modern ensemble is my main purpose (or if I had a lot of money to spend).