I'll try to reply your question as comprehensive as I can.
Since I was using UltraWide SCSI adapter Buslogic-Mylex BT-950 with Seagate Cheetah X15-LP, I found that this adapter is not sufficient for managing Ultra160 performance, even though it guarantees 40MB/sec. Therefore I bought Kouwell KW-898B dual channel Ultra160 SCSI adapter with LSILopgic 53C1010-66 chip onboard. I must say, that every U160 drive WILL (not should!!!, again: WILL) work on U160 capable host adapter on U160 channel using UW cable (not twisted, not any LVD). However, the drive(s) performance attached to this cable will be downgraded to 40MB/sec max. Therefore I recommend you to buy U160 cable and the performance reveals from that. You will notice performance boost when you have fast drive(s). Remember, you will not use 160MB/sec bandwidth completely unless you have your U160 HA fitted in 64-bit PCI slot. There is lot of other stuff and information which I can provide, but let me know what you need to know. This was really only BRIEF INFORMATION, please do not consider this as an exhaustive information from me
P.S. I'm an SCSI HW developer and SCSI active home user. If you need any help, feel free to contact me....