“Your suggestion is non-responsive to the specification.”
I’ve recommended an intel mac mini for that budget. If not the mac mini then any other Apple that has at a minimum an intel based machine for running the current and future Apple OS.
The current system is Leopard, OS X 10.5.5 and
it runs just fine on a G4 1Ghz powerbook & a G4 1 Ghz iMac.