A laptop-style hard drive uses less power.Western Digital Caviar Blue WD5000AAKS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
A SATA laptop drive has the same connections as a 3.5" drive, so you don't need any special adapters or anything.
There are some of us who avoid Jetway products as a general rule.JetWay JNC62K-LF AM2+/AM2 NVIDIA GeForce 8200 Mini ITX AMD Motherboard
There is an equivilant Zotac board that is generally rated better, but it is also more expensive.
I would search around these and other small-form-factor related forums for reviews of Jetway boards and weigh that information when making your decision.