Personally, I only buy Samsung drives if I can. But that's me.
It really depends.. does your MB support SATA? I assume that it does. The highest data transfer rate you're going to achieve with a regular IDE ATA drive is 133, whereas, SATA has transfer rates up to 150 (mbps, I believe).
So, no.. you don't have to go with SATA, but it certainly is better and will be the future of HD connections for some time. Also, you'll need SATA drives if you ever plan on going with a RAID connection.
Btw. You can have RAID on IDE, but you have to have it on the same cable, so it is not as fast (It will have 133mb/s shared between both drives, where as SATA has 150mb/s for each drive if you have it in a RAID setup.