Don't buy the Ramsey 07 unless you are sure you can get the DMAC 04. They MUST!!! be put in as a pair. Otherwise, you have to go with the earlier versions of both, which is what originally came with the A1000. The SCSI 08 chip & the Buster 11 can still be found. There are Ramsey 07's around because it was used in the A4000. The problem is finding the DMAC 04 chip. I think these only shipped with some of the A3000T's. There is no known stock of them anywhere that I have heard of. 6 or 7 years ago when Software Hut still had them they were selling for $70. I have seen the SCSI 08 chips sell for $50. The Buster 11's in the $30 range.
Dan