For the SCSI card I`d either recommend an Oktagon 2008 (at least ROM-Version 6.8 with 6.12 being the latest) or an A2091 (at least ROM-Version 6.6 with 7.0 being the latest).
The GVP controllers tend to be alittle troublesome when it comes to CD-ROMs. this is mostly due to outdated ROMs.
Here two pages where you can look what is out there:
http://www.amiga-hardware.com/http://amiga.resource.cx/There are some dealers left all over the world where you still can purchase some new things. For the rest there is allways Ebay or other online fleamarkets.
Germany:
www.vesalia.dewww.kdh-shop.deUK:
www.amigakit.comUS:
http://www.softhut.com/There are probably some more but that are those that spring to mind.