You can run the Slot-T on a BH6 1.0x or 1.1. The easy way to tell is look at your printer, PS2, serial ports. 1.0x are white, 1.1 are colored. The thing with the 1.0x is there *may be an issue with older revs with the MOSFETs not handling the current. I can't say for sure if this is an issue. Look at the mobo to the left of the CPU slot near the printer port. You will see two little black MOSFETs. There will be a number on them, 45n03, 50n03, 55n03. If you have the 45n03, those are the ones that may have issues.
I agree on the IDE controller. If you have a modern drive that is faster than 33 MB/sec xfer rate, put in the controller.