My current favorite SCSI drive is the Seagate Savvio series. It's a 2.5" SCA U320 drive that is very quiet and the power consumption is very reasonable. It seems to support termination too and works fine in my SE/30 with one of the $2.75 SCA to 50 pin adapters. The SCA model is available in 36 and 74GB capacities, ridiculous for a vintage Mac, but it works fine to just have one or two 2GB (or smaller) partitions. Those going for complete originality will want to look elsewhere, but if you just want to make the machine work without any serious hacking, this is one way to do it. The best part is they can be had for ~$20 bucks easily.