> Can anybody here recommend an actual DSLR body which I can use with my lenses?
Canon EOS 5D (Mark I) ::-
> Some DSLRs offer autofocus inside the camera so the old lenses should also be able to AF. Is this recommendable?
Which DSLR's should this be? The only SLR (I know) that offers this possibility is the Contax AX
> Does anybody have experience with the Y/C to Sony adapter (there is some little modification necessary in the lense ...)
Sorry, no ... only with Canon, Sigma and Nikon (you lose infinity with Nikon due to the register distance)
> Adapters without lenses only work with full-format sensors. Those cameras are very expensive. Can anybody give me information about adapters with lense(s) for use with DSLR's with smaller sensors?
That is simply untrue - the critical thing is the register distance which is 45,5mm with C/Y - any SLR with less distance (EF 44,0mm, Sony 44,5mm) can use a lens with infinity focus with an adapter.