Yes, value's not bad. It's probably a lot more powerful than you need but should last you a good few years.
If you're not into gaming, then the onboard graphics should be sufficient for the PC's use (should be easily upgradeable if required).
To fit more IDE drives you can get an IDE PCI controller card click here. Note that this will leave 1 PCI slot free. G
P.S. ASRock ConRoe945G-DVI specs for reference click here