The Super Flower Golden Green Modular 600W ATX 2.3 (SF-600P14XE) has 10x SATA and 9x IDE, so with 6x IDE-SATA adapters, you should be able to do without Y-connectors.
Price should be around US$100.
Below 600W, there's the Antec TruePower New TP-550, 550W ATX 2.3 (0761345-07657-9/0761345-07658-6), but that's not cheaper, less efficient, using a smaller fan, only 9x SATA.
Antec has 5 year warranty though.
To get 16x SATA out of the box, you'll be looking at this: Enermax Revolution85+ 850W ATX 2.3 (ERV850EWT) at 200 dollar, and vastly overpowered. For the same price, and slightly more efficient, supposedly, there's also this: SilverStone Strider Gold Series 1200W ATX 2.3 (SST-ST1200-G)