CDS2 can be run with a Teddy XPS no problem. CDi cannot be run with external PSU, but it sounds so good without one, why would you.... CDS on the other hand was made and designed with the CDPS in mind, and all the better for it, it has more caps in than a standard XPS/XPS2 and sounds better IMO. I think, but not certain, that the CDS can run from an XPS and therefore Teddy, but you may need a modified Burndy. Personally if you are going to bother with the CDS, the CDPS should be used with it. Also bear in mind that the CDS head unit is the part that may give you problems at some stage with the transport, and although you may be able to get it fixed, you may not. CDPS's are also cheaper than XPS too, but more expensive to service due to the extra caps. If it were me, i'd hunt for the best CDS/CDPS i could find or just use a CDI.