Nice stand! I built my own as well and will be starting my own journal soon.
The Eheim 2217 is on sale at Foster and Smith here : http://www.fosterandsmithaquatics.co...03&pcatid=3603
I picked up 2 at that price (that price is found at other websites as well and you might find better deals in swaps forums if the timing's right) and also 2 2215 impellers which can be swapped in apparently, so it's basically like I have a very customizeable filtration set-up for any tanks in my future if I upgrade out of the 40 - from a single 2215 up to two full blast 2217s, with options in between by swapping impellers around, changing spraybar hole sizes, using outlet valves to throttle...
Excited to see someone starting a 40 breeder around the same time as me!