Wadia 27/270 vs. dCS Delius+Purcell

Hallo, I want to spend some kilobuck in a new cd-combo and think to buy either a Wadia 27/270 or a dCS DAC Delius with upsampler Purcell. Does somebody has experiences? I have the following questions:
1. Is the Wadia or the dCS the 'better' one?
2. For the dCS I need a transport too. Some people told me, that the transport for the dCS do not neeed to be super expensive because the Purcell will 'upsamle' some weeknesses of the transport as well. A transport of about $ 2.000 would do. Is this right or do I need to buy an superexpensive transport as well? Which transports go well with the dCS?
3. The Wadia and the dCS do not need a preamp, theoreticlly. Here at audiogon one can read that the experiences with Wadia with or without pre are very incoherent. Half people strictly recommend a (good) pre, the other half strictly recommend no pre. How about the dCS? Does this combo need a (good) pre or does it run as good without?
Best regards from Germany and thanks for good advice in advance! Sebastian Hatzfeldt