Funny, I was just going over AD's website... It makes the TI solution look grim.
Analog has ADC specificly for RTD inputs, which makes things more interesting but not necessarily easier, except for the current supply.
I'll try out something and advise later. Thanks for the tip Talcum!
In the mean time:
http://www.analog.com/UploadedFiles/...792_93_prf.pdf
(PDF: AD7793, 18 pages)