If you have only one 4-pin (molex) left which you want to use for fan then I think you better look for a Sata drive (of course if you have free sata power cables). But there also is another solution, that is using adapters.
Its expensive for being older technology. You know.. as DDR are more expensive than DDR2 and DDR3. IDE really is not an option when you have a Sata board. I bought it because at that time I had an IDE board with P4 and was in desperate need of more space but had not enough money to build a new system with Sata board from scratch.
Anywas, good luck. I will let you know if I get any Sata drive.