So it looks like the Avalon units are around $300 for 4.5 gh/s of hash power. Is this something that you think is feasible in terms of money and hash power?
Assuming you mean the group buys of Avalon chips, plus board assembly (Klondike et al), yes, possibly. But you're late to the party so will be well down the queue for delivery, which will hit your ROI hard.
I posted this elsewhere, but its relevant here ...